Underscore is a JavaScript library that provides a whole mess of useful functional programming helpers without extending any built-in objects. It’s the answer to the question: “If I sit down in front of a blank HTML page, and want to start being productive immediately, what do I need?” … and the tie to go along with jQuery's tux and Backbone's suspenders.

Underscore provides over 100 functions that support both your favorite workaday functional helpers: map, filter, invoke — as well as more specialized goodies: function binding, javascript templating, creating quick indexes, deep equality testing, and so on.

A complete Test Suite is included for your perusal.

You may also read through the annotated source code. There is a modular version with clickable import references as well.

You may choose between monolithic and modular imports. There is a quick summary of the options below, as well as a more comprehensive discussion in the article.

Enjoying Underscore, and want to turn it up to 11? Try Underscore-contrib.

The project is hosted on GitHub. You can report bugs and discuss features on the issues page or chat in the Gitter channel.

You can support the project by donating on Patreon. Enterprise coverage is available as part of the Tidelift Subscription.

Underscore is an open-source component of DocumentCloud.

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v1.13.6 CDN URLs (Use with <script src="..."></script>)

In most cases, you can replace the version number above by latest so that your embed will automatically use the latest version, or stable if you want to delay updating until an update has proven to be free of accidental breaking changes. Example:

Package Installation

If you are hardcoding the path to the file within the package and you are unsure which build to use, it is very likely that you need underscore-umd.js or the minified variant underscore-umd-min.js.

Monolithic Import (recommended)

Modular Import

For functions with multiple aliases, the file name of the module is always the first name that appears in the documentation. For example, _.reduce/_.inject/_.foldl is exported from underscore/modules/reduce.js. Modular usage is mostly recommended for creating a customized build of Underscore.

Engine Compatibility

Underscore 1.x is backwards compatible with any engine that fully supports ES3, while also utilizing newer features when available, such as Object.keys, typed arrays and ES modules. We routinely run our unittests against the JavaScript engines listed below:

In addition:

Underscore 2.x will likely remove support for some outdated environments.

Collection Functions (Arrays or Objects)

each_.each(list, iteratee, [context]) Alias: forEach source
Iterates over a list of elements, yielding each in turn to an iteratee function. The iteratee is bound to the context object, if one is passed. Each invocation of iteratee is called with three arguments: (element, index, list). If list is a JavaScript object, iteratee's arguments will be (value, key, list). Returns the list for chaining.

_.each([1, 2, 3], alert);
=> alerts each number in turn...
_.each({one: 1, two: 2, three: 3}, alert);
=> alerts each number value in turn...

Note: Collection functions work on arrays, objects, and array-like objects such as arguments, NodeList and similar. But it works by duck-typing, so avoid passing objects with a numeric length property. It's also good to note that an each loop cannot be broken out of — to break, use _.find instead.

map_.map(list, iteratee, [context]) Alias: collect source
Produces a new array of values by mapping each value in list through a transformation function (iteratee). The iteratee is passed three arguments: the value, then the index (or key) of the iteration, and finally a reference to the entire list.

_.map([1, 2, 3], function(num){ return num * 3; });
=> [3, 6, 9]
_.map({one: 1, two: 2, three: 3}, function(num, key){ return num * 3; });
=> [3, 6, 9]
_.map([[1, 2], [3, 4]], _.first);
=> [1, 3]

reduce_.reduce(list, iteratee, [memo], [context]) Aliases: inject, foldl source
Also known as inject and foldl, reduce boils down a list of values into a single value. Memo is the initial state of the reduction, and each successive step of it should be returned by iteratee. The iteratee is passed four arguments: the memo, then the value and index (or key) of the iteration, and finally a reference to the entire list.

If no memo is passed to the initial invocation of reduce, the iteratee is not invoked on the first element of the list. The first element is instead passed as the memo in the invocation of the iteratee on the next element in the list.

var sum = _.reduce([1, 2, 3], function(memo, num){ return memo + num; }, 0);
=> 6

reduceRight_.reduceRight(list, iteratee, [memo], [context]) Alias: foldr source
The right-associative version of reduce. Foldr is not as useful in JavaScript as it would be in a language with lazy evaluation.

var list = [[0, 1], [2, 3], [4, 5]];
var flat = _.reduceRight(list, function(a, b) { return a.concat(b); }, []);
=> [4, 5, 2, 3, 0, 1]

find_.find(list, predicate, [context]) Alias: detect source
Looks through each value in the list, returning the first one that passes a truth test (predicate), or undefined if no value passes the test. The function returns as soon as it finds an acceptable element, and doesn't traverse the entire list. predicate is transformed through iteratee to facilitate shorthand syntaxes.

var even = _.find([1, 2, 3, 4, 5, 6], function(num){ return num % 2 == 0; });
=> 2

filter_.filter(list, predicate, [context]) Alias: select source
Looks through each value in the list, returning an array of all the values that pass a truth test (predicate). predicate is transformed through iteratee to facilitate shorthand syntaxes.

var evens = _.filter([1, 2, 3, 4, 5, 6], function(num){ return num % 2 == 0; });
=> [2, 4, 6]

findWhere_.findWhere(list, properties) source
Looks through the list and returns the first value that matches all of the key-value pairs listed in properties.

If no match is found, or if list is empty, undefined will be returned.

_.findWhere(publicServicePulitzers, {newsroom: "The New York Times"});
=> {year: 1918, newsroom: "The New York Times",
  reason: "For its public service in publishing in full so many official reports,
  documents and speeches by European statesmen relating to the progress and
  conduct of the war."}

where_.where(list, properties) source
Looks through each value in the list, returning an array of all the values that matches the key-value pairs listed in properties.

_.where(listOfPlays, {author: "Shakespeare", year: 1611});
=> [{title: "Cymbeline", author: "Shakespeare", year: 1611},
    {title: "The Tempest", author: "Shakespeare", year: 1611}]

reject_.reject(list, predicate, [context]) source
Returns the values in list without the elements that the truth test (predicate) passes. The opposite of filter. predicate is transformed through iteratee to facilitate shorthand syntaxes.

var odds = _.reject([1, 2, 3, 4, 5, 6], function(num){ return num % 2 == 0; });
=> [1, 3, 5]

every_.every(list, [predicate], [context]) Alias: all source
Returns true if all of the values in the list pass the predicate truth test. Short-circuits and stops traversing the list if a false element is found. predicate is transformed through iteratee to facilitate shorthand syntaxes.

_.every([2, 4, 5], function(num) { return num % 2 == 0; });
=> false

some_.some(list, [predicate], [context]) Alias: any source
Returns true if any of the values in the list pass the predicate truth test. Short-circuits and stops traversing the list if a true element is found. predicate is transformed through iteratee to facilitate shorthand syntaxes.

_.some([null, 0, 'yes', false]);
=> true

contains_.contains(list, value, [fromIndex]) Aliases: include, includes source
Returns true if the value is present in the list. Uses indexOf internally, if list is an Array. Use fromIndex to start your search at a given index.

_.contains([1, 2, 3], 3);
=> true

invoke_.invoke(list, methodName, *arguments) source
Calls the method named by methodName on each value in the list. Any extra arguments passed to invoke will be forwarded on to the method invocation.

_.invoke([[5, 1, 7], [3, 2, 1]], 'sort');
=> [[1, 5, 7], [1, 2, 3]]

pluck_.pluck(list, propertyName) source
A convenient version of what is perhaps the most common use-case for map: extracting a list of property values.

var stooges = [{name: 'moe', age: 40}, {name: 'larry', age: 50}, {name: 'curly', age: 60}];
_.pluck(stooges, 'name');
=> ["moe", "larry", "curly"]

max_.max(list, [iteratee], [context]) source
Returns the maximum value in list. If an iteratee function is provided, it will be used on each value to generate the criterion by which the value is ranked. -Infinity is returned if list is empty, so an isEmpty guard may be required. This function can currently only compare numbers reliably. This function uses operator < (note).

var stooges = [{name: 'moe', age: 40}, {name: 'larry', age: 50}, {name: 'curly', age: 60}];
_.max(stooges, function(stooge){ return stooge.age; });
=> {name: 'curly', age: 60};

min_.min(list, [iteratee], [context]) source
Returns the minimum value in list. If an iteratee function is provided, it will be used on each value to generate the criterion by which the value is ranked. Infinity is returned if list is empty, so an isEmpty guard may be required. This function can currently only compare numbers reliably. This function uses operator < (note).

var numbers = [10, 5, 100, 2, 1000];
=> 2

sortBy_.sortBy(list, iteratee, [context]) source
Returns a (stably) sorted copy of list, ranked in ascending order by the results of running each value through iteratee. iteratee may also be the string name of the property to sort by (eg. length). This function uses operator < (note).

_.sortBy([1, 2, 3, 4, 5, 6], function(num){ return Math.sin(num); });
=> [5, 4, 6, 3, 1, 2]

var stooges = [{name: 'moe', age: 40}, {name: 'larry', age: 50}, {name: 'curly', age: 60}];
_.sortBy(stooges, 'name');
=> [{name: 'curly', age: 60}, {name: 'larry', age: 50}, {name: 'moe', age: 40}];

groupBy_.groupBy(list, iteratee, [context]) source
Splits a collection into sets, grouped by the result of running each value through iteratee. If iteratee is a string instead of a function, groups by the property named by iteratee on each of the values.

_.groupBy([1.3, 2.1, 2.4], function(num){ return Math.floor(num); });
=> {1: [1.3], 2: [2.1, 2.4]}

_.groupBy(['one', 'two', 'three'], 'length');
=> {3: ["one", "two"], 5: ["three"]}

indexBy_.indexBy(list, iteratee, [context]) source
Given a list, and an iteratee function that returns a key for each element in the list (or a property name), returns an object with an index of each item. Just like groupBy, but for when you know your keys are unique.

var stooges = [{name: 'moe', age: 40}, {name: 'larry', age: 50}, {name: 'curly', age: 60}];
_.indexBy(stooges, 'age');
=> {
  "40": {name: 'moe', age: 40},
  "50": {name: 'larry', age: 50},
  "60": {name: 'curly', age: 60}

countBy_.countBy(list, iteratee, [context]) source
Sorts a list into groups and returns a count for the number of objects in each group. Similar to groupBy, but instead of returning a list of values, returns a count for the number of values in that group.

_.countBy([1, 2, 3, 4, 5], function(num) {
  return num % 2 == 0 ? 'even': 'odd';
=> {odd: 3, even: 2}

shuffle_.shuffle(list) source
Returns a shuffled copy of the list, using a version of the Fisher-Yates shuffle.

_.shuffle([1, 2, 3, 4, 5, 6]);
=> [4, 1, 6, 3, 5, 2]

sample_.sample(list, [n]) source
Produce a random sample from the list. Pass a number to return n random elements from the list. Otherwise a single random item will be returned.

_.sample([1, 2, 3, 4, 5, 6]);
=> 4

_.sample([1, 2, 3, 4, 5, 6], 3);
=> [1, 6, 2]

toArray_.toArray(list) source
Creates a real Array from the list (anything that can be iterated over). Useful for transmuting the arguments object.

(function(){ return _.toArray(arguments).slice(1); })(1, 2, 3, 4);
=> [2, 3, 4]

size_.size(list) source
Return the number of values in the list.

_.size([1, 2, 3, 4, 5]);
=> 5

_.size({one: 1, two: 2, three: 3});
=> 3

partition_.partition(list, predicate) source
Split list into two arrays: one whose elements all satisfy predicate and one whose elements all do not satisfy predicate. predicate is transformed through iteratee to facilitate shorthand syntaxes.

_.partition([0, 1, 2, 3, 4, 5], isOdd);
=> [[1, 3, 5], [0, 2, 4]]

compact_.compact(list) source
Returns a copy of the list with all falsy values removed. In JavaScript, false, null, 0, "", undefined and NaN are all falsy.

_.compact([0, 1, false, 2, '', 3]);
=> [1, 2, 3]

Array Functions

Note: All array functions will also work on the arguments object. However, Underscore functions are not designed to work on "sparse" arrays.

first_.first(array, [n]) Aliases: head, take source
Returns the first element of an array. Passing n will return the first n elements of the array.

_.first([5, 4, 3, 2, 1]);
=> 5

initial_.initial(array, [n]) source
Returns everything but the last entry of the array. Especially useful on the arguments object. Pass n to exclude the last n elements from the result.

_.initial([5, 4, 3, 2, 1]);
=> [5, 4, 3, 2]

last_.last(array, [n]) source
Returns the last element of an array. Passing n will return the last n elements of the array.

_.last([5, 4, 3, 2, 1]);
=> 1

rest_.rest(array, [index]) Aliases: tail, drop source
Returns the rest of the elements in an array. Pass an index to return the values of the array from that index onward.

_.rest([5, 4, 3, 2, 1]);
=> [4, 3, 2, 1]

flatten_.flatten(array, [depth]) source
Flattens a nested array. If you pass true or 1 as the depth, the array will only be flattened a single level. Passing a greater number will cause the flattening to descend deeper into the nesting hierarchy. Omitting the depth argument, or passing false or Infinity, flattens the array all the way to the deepest nesting level.

_.flatten([1, [2], [3, [[4]]]]);
=> [1, 2, 3, 4];

_.flatten([1, [2], [3, [[4]]]], true);
=> [1, 2, 3, [[4]]];

_.flatten([1, [2], [3, [[4]]]], 2);
=> [1, 2, 3, [4]];

without_.without(array, *values) source
Returns a copy of the array with all instances of the values removed.

_.without([1, 2, 1, 0, 3, 1, 4], 0, 1);
=> [2, 3, 4]

union_.union(*arrays) source
Computes the union of the passed-in arrays: the list of unique items, in order, that are present in one or more of the arrays.

_.union([1, 2, 3], [101, 2, 1, 10], [2, 1]);
=> [1, 2, 3, 101, 10]

intersection_.intersection(*arrays) source
Computes the list of values that are the intersection of all the arrays. Each value in the result is present in each of the arrays.

_.intersection([1, 2, 3], [101, 2, 1, 10], [2, 1]);
=> [1, 2]

difference_.difference(array, *others) source
Similar to without, but returns the values from array that are not present in the other arrays.

_.difference([1, 2, 3, 4, 5], [5, 2, 10]);
=> [1, 3, 4]

uniq_.uniq(array, [isSorted], [iteratee]) Alias: unique source
Produces a duplicate-free version of the array, using === to test object equality. In particular only the first occurrence of each value is kept. If you know in advance that the array is sorted, passing true for isSorted will run a much faster algorithm. If you want to compute unique items based on a transformation, pass an iteratee function.

_.uniq([1, 2, 1, 4, 1, 3]);
=> [1, 2, 4, 3]

zip_.zip(*arrays) source
Merges together the values of each of the arrays with the values at the corresponding position. Useful when you have separate data sources that are coordinated through matching array indexes.

_.zip(['moe', 'larry', 'curly'], [30, 40, 50], [true, false, false]);
=> [["moe", 30, true], ["larry", 40, false], ["curly", 50, false]]

unzip_.unzip(array) Alias: transpose source
The opposite of zip. Given an array of arrays, returns a series of new arrays, the first of which contains all of the first elements in the input arrays, the second of which contains all of the second elements, and so on. If you're working with a matrix of nested arrays, this can be used to transpose the matrix.

_.unzip([["moe", 30, true], ["larry", 40, false], ["curly", 50, false]]);
=> [['moe', 'larry', 'curly'], [30, 40, 50], [true, false, false]]

object_.object(list, [values]) source
Converts arrays into objects. Pass either a single list of [key, value] pairs, or a list of keys, and a list of values. Passing by pairs is the reverse of pairs. If duplicate keys exist, the last value wins.

_.object(['moe', 'larry', 'curly'], [30, 40, 50]);
=> {moe: 30, larry: 40, curly: 50}

_.object([['moe', 30], ['larry', 40], ['curly', 50]]);
=> {moe: 30, larry: 40, curly: 50}

chunk_.chunk(array, length) source
Chunks an array into multiple arrays, each containing length or fewer items.

var partners = _.chunk(_.shuffle(kindergarten), 2);
=> [["Tyrone", "Elie"], ["Aidan", "Sam"], ["Katrina", "Billie"], ["Little Timmy"]]

indexOf_.indexOf(array, value, [isSorted]) source
Returns the index at which value can be found in the array, or -1 if value is not present in the array. If you're working with a large array, and you know that the array is already sorted, pass true for isSorted to use a faster binary search ... or, pass a number as the third argument in order to look for the first matching value in the array after the given index. If isSorted is true, this function uses operator < (note).

_.indexOf([1, 2, 3], 2);
=> 1

lastIndexOf_.lastIndexOf(array, value, [fromIndex]) source
Returns the index of the last occurrence of value in the array, or -1 if value is not present. Pass fromIndex to start your search at a given index.

_.lastIndexOf([1, 2, 3, 1, 2, 3], 2);
=> 4

sortedIndex_.sortedIndex(array, value, [iteratee], [context]) source
Uses a binary search to determine the smallest index at which the value should be inserted into the array in order to maintain the array's sorted order. If an iteratee function is provided, it will be used to compute the sort ranking of each value, including the value you pass. The iteratee may also be the string name of the property to sort by (eg. length). This function uses operator < (note).

_.sortedIndex([10, 20, 30, 40, 50], 35);
=> 3

var stooges = [{name: 'moe', age: 40}, {name: 'curly', age: 60}];
_.sortedIndex(stooges, {name: 'larry', age: 50}, 'age');
=> 1

findIndex_.findIndex(array, predicate, [context]) source
Similar to _.indexOf, returns the first index where the predicate truth test passes; otherwise returns -1.

_.findIndex([4, 6, 8, 12], isPrime);
=> -1 // not found
_.findIndex([4, 6, 7, 12], isPrime);
=> 2

findLastIndex_.findLastIndex(array, predicate, [context]) source
Like _.findIndex but iterates the array in reverse, returning the index closest to the end where the predicate truth test passes.

var users = [{'id': 1, 'name': 'Bob', 'last': 'Brown'},
             {'id': 2, 'name': 'Ted', 'last': 'White'},
             {'id': 3, 'name': 'Frank', 'last': 'James'},
             {'id': 4, 'name': 'Ted', 'last': 'Jones'}];
_.findLastIndex(users, {
  name: 'Ted'
=> 3

range_.range([start], stop, [step]) source
A function to create flexibly-numbered lists of integers, handy for each and map loops. start, if omitted, defaults to 0; step defaults to 1 if start is before stop, otherwise -1. Returns a list of integers from start (inclusive) to stop (exclusive), incremented (or decremented) by step.

=> [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
_.range(1, 11);
=> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
_.range(0, 30, 5);
=> [0, 5, 10, 15, 20, 25]
_.range(0, -10, -1);
=> [0, -1, -2, -3, -4, -5, -6, -7, -8, -9]
=> []

Function (uh, ahem) Functions

bind_.bind(function, object, *arguments) source
Bind a function to an object, meaning that whenever the function is called, the value of this will be the object. Optionally, pass arguments to the function to pre-fill them, also known as partial application. For partial application without context binding, use partial.

var func = function(greeting){ return greeting + ': ' + this.name };
func = _.bind(func, {name: 'moe'}, 'hi');
=> 'hi: moe'

bindAll_.bindAll(object, *methodNames) source
Binds a number of methods on the object, specified by methodNames, to be run in the context of that object whenever they are invoked. Very handy for binding functions that are going to be used as event handlers, which would otherwise be invoked with a fairly useless this. methodNames are required.

var buttonView = {
  label  : 'underscore',
  onClick: function(){ alert('clicked: ' + this.label); },
  onHover: function(){ console.log('hovering: ' + this.label); }
_.bindAll(buttonView, 'onClick', 'onHover');
// When the button is clicked, this.label will have the correct value.
jQuery('#underscore_button').on('click', buttonView.onClick);

partial_.partial(function, *arguments) source
Partially apply a function by filling in any number of its arguments, without changing its dynamic this value. A close cousin of bind. You may pass _ in your list of arguments to specify an argument that should not be pre-filled, but left open to supply at call-time. Note: if you need _ placeholders and a this binding at the same time, use both _.partial and _.bind.

var subtract = function(a, b) { return b - a; };
sub5 = _.partial(subtract, 5);
=> 15

// Using a placeholder
subFrom20 = _.partial(subtract, _, 20);
=> 15

memoize_.memoize(function, [hashFunction]) source
Memoizes a given function by caching the computed result. Useful for speeding up slow-running computations. If passed an optional hashFunction, it will be used to compute the hash key for storing the result, based on the arguments to the original function. The default hashFunction just uses the first argument to the memoized function as the key. The cache of memoized values is available as the cache property on the returned function.

var fibonacci = _.memoize(function(n) {
  return n < 2 ? n: fibonacci(n - 1) + fibonacci(n - 2);

delay_.delay(function, wait, *arguments) source
Much like setTimeout, invokes function after wait milliseconds. If you pass the optional arguments, they will be forwarded on to the function when it is invoked.

var log = _.bind(console.log, console);
_.delay(log, 1000, 'logged later');
=> 'logged later' // Appears after one second.

defer_.defer(function, *arguments) source
Defers invoking the function until the current call stack has cleared, similar to using setTimeout with a delay of 0. Useful for performing expensive computations or HTML rendering in chunks without blocking the UI thread from updating. If you pass the optional arguments, they will be forwarded on to the function when it is invoked.

_.defer(function(){ alert('deferred'); });
// Returns from the function before the alert runs.

throttle_.throttle(function, wait, [options]) source
Creates and returns a new, throttled version of the passed function, that, when invoked repeatedly, will only actually call the original function at most once per every wait milliseconds. Useful for rate-limiting events that occur faster than you can keep up with.

By default, throttle will execute the function as soon as you call it for the first time, and, if you call it again any number of times during the wait period, as soon as that period is over. If you'd like to disable the leading-edge call, pass {leading: false}, and if you'd like to disable the execution on the trailing-edge, pass
{trailing: false}.

var throttled = _.throttle(updatePosition, 100);

If you need to cancel a scheduled throttle, you can call .cancel() on the throttled function.

debounce_.debounce(function, wait, [immediate]) source
Creates and returns a new debounced version of the passed function which will postpone its execution until after wait milliseconds have elapsed since the last time it was invoked. Useful for implementing behavior that should only happen after the input has stopped arriving. For example: rendering a preview of a Markdown comment, recalculating a layout after the window has stopped being resized, and so on.

At the end of the wait interval, the function will be called with the arguments that were passed most recently to the debounced function.

Pass true for the immediate argument to cause debounce to trigger the function on the leading instead of the trailing edge of the wait interval. Useful in circumstances like preventing accidental double-clicks on a "submit" button from firing a second time.

var lazyLayout = _.debounce(calculateLayout, 300);

If you need to cancel a scheduled debounce, you can call .cancel() on the debounced function.

once_.once(function) source
Creates a version of the function that can only be called one time. Repeated calls to the modified function will have no effect, returning the value from the original call. Useful for initialization functions, instead of having to set a boolean flag and then check it later.

var initialize = _.once(createApplication);
// Application is only created once.

after_.after(count, function) source
Creates a wrapper of function that does nothing at first. From the count-th call onwards, it starts actually calling function. Useful for grouping asynchronous responses, where you want to be sure that all the async calls have finished, before proceeding.

var renderNotes = _.after(notes.length, render);
_.each(notes, function(note) {
  note.asyncSave({success: renderNotes});
// renderNotes is run once, after all notes have saved.

before_.before(count, function) source
Creates a wrapper of function that memoizes its return value. From the count-th call onwards, the memoized result of the last invocation is returned immediately instead of invoking function again. So the wrapper will invoke function at most count - 1 times.

var monthlyMeeting = _.before(3, askForRaise);
// the result of any subsequent calls is the same as the second call

wrap_.wrap(function, wrapper) source
Wraps the first function inside of the wrapper function, passing it as the first argument. This allows the wrapper to execute code before and after the function runs, adjust the arguments, and execute it conditionally.

var hello = function(name) { return "hello: " + name; };
hello = _.wrap(hello, function(func) {
  return "before, " + func("moe") + ", after";
=> 'before, hello: moe, after'

negate_.negate(predicate) source
Returns a new negated version of the predicate function.

var isFalsy = _.negate(Boolean);
_.find([-2, -1, 0, 1, 2], isFalsy);
=> 0

compose_.compose(*functions) source
Returns the composition of a list of functions, where each function consumes the return value of the function that follows. In math terms, composing the functions f(), g(), and h() produces f(g(h())).

var greet    = function(name){ return "hi: " + name; };
var exclaim  = function(statement){ return statement.toUpperCase() + "!"; };
var welcome = _.compose(greet, exclaim);
=> 'hi: MOE!'

restArguments_.restArguments(function, [startIndex]) source
Returns a version of the function that, when called, receives all arguments from and beyond startIndex collected into a single array. If you don’t pass an explicit startIndex, it will be determined by looking at the number of arguments to the function itself. Similar to ES6’s rest parameters syntax.

var raceResults = _.restArguments(function(gold, silver, bronze, everyoneElse) {
  _.each(everyoneElse, sendConsolations);

raceResults("Dopey", "Grumpy", "Happy", "Sneezy", "Bashful", "Sleepy", "Doc");

Object Functions

keys_.keys(object) source
Retrieve all the names of the object's own enumerable properties.

_.keys({one: 1, two: 2, three: 3});
=> ["one", "two", "three"]

allKeys_.allKeys(object) source
Retrieve all the names of object's own and inherited properties.

function Stooge(name) {
  this.name = name;
Stooge.prototype.silly = true;
_.allKeys(new Stooge("Moe"));
=> ["name", "silly"]

values_.values(object) source
Return all of the values of the object's own properties.

_.values({one: 1, two: 2, three: 3});
=> [1, 2, 3]

mapObject_.mapObject(object, iteratee, [context]) source
Like map, but for objects. Transform the value of each property in turn.

_.mapObject({start: 5, end: 12}, function(val, key) {
  return val + 5;
=> {start: 10, end: 17}

pairs_.pairs(object) source
Convert an object into a list of [key, value] pairs. The opposite of object.

_.pairs({one: 1, two: 2, three: 3});
=> [["one", 1], ["two", 2], ["three", 3]]

invert_.invert(object) source
Returns a copy of the object where the keys have become the values and the values the keys. For this to work, all of your object's values should be unique and string serializable.

_.invert({Moe: "Moses", Larry: "Louis", Curly: "Jerome"});
=> {Moses: "Moe", Louis: "Larry", Jerome: "Curly"};

create_.create(prototype, props) source
Creates a new object with the given prototype, optionally attaching props as own properties. Basically, Object.create, but without all of the property descriptor jazz.

var moe = _.create(Stooge.prototype, {name: "Moe"});

functions_.functions(object) Alias: methods source
Returns a sorted list of the names of every method in an object — that is to say, the name of every function property of the object.

=> ["all", "any", "bind", "bindAll", "clone", "compact", "compose" ...

findKey_.findKey(object, predicate, [context]) source
Similar to _.findIndex but for keys in objects. Returns the key where the predicate truth test passes or undefined. predicate is transformed through iteratee to facilitate shorthand syntaxes.

extend_.extend(destination, *sources) source
Shallowly copy all of the properties in the source objects over to the destination object, and return the destination object. Any nested objects or arrays will be copied by reference, not duplicated. It's in-order, so the last source will override properties of the same name in previous arguments.

_.extend({name: 'moe'}, {age: 50});
=> {name: 'moe', age: 50}

extendOwn_.extendOwn(destination, *sources) Alias: assign source
Like extend, but only copies own properties over to the destination object.

pick_.pick(object, *keys) source
Return a copy of the object, filtered to only have values for the allowed keys (or array of valid keys). Alternatively accepts a predicate indicating which keys to pick.

_.pick({name: 'moe', age: 50, userid: 'moe1'}, 'name', 'age');
=> {name: 'moe', age: 50}
_.pick({name: 'moe', age: 50, userid: 'moe1'}, function(value, key, object) {
  return _.isNumber(value);
=> {age: 50}

omit_.omit(object, *keys) source
Return a copy of the object, filtered to omit the disallowed keys (or array of keys). Alternatively accepts a predicate indicating which keys to omit.

_.omit({name: 'moe', age: 50, userid: 'moe1'}, 'userid');
=> {name: 'moe', age: 50}
_.omit({name: 'moe', age: 50, userid: 'moe1'}, function(value, key, object) {
  return _.isNumber(value);
=> {name: 'moe', userid: 'moe1'}

defaults_.defaults(object, *defaults) source
Returns object after filling in its undefined properties with the first value present in the following list of defaults objects.

var iceCream = {flavor: "chocolate"};
_.defaults(iceCream, {flavor: "vanilla", sprinkles: "lots"});
=> {flavor: "chocolate", sprinkles: "lots"}

clone_.clone(object) source
Create a shallow-copied clone of the provided plain object. Any nested objects or arrays will be copied by reference, not duplicated.

_.clone({name: 'moe'});
=> {name: 'moe'};

tap_.tap(object, interceptor) source
Invokes interceptor with the object, and then returns object. The primary purpose of this method is to "tap into" a method chain, in order to perform operations on intermediate results within the chain.

  .filter(function(num) { return num % 2 == 0; })
  .map(function(num) { return num * num })
=> // [2, 200] (alerted)
=> [4, 40000]

toPath_.toPath(path) source
Ensures that path is an array. If path is a string, it is wrapped in a single-element array; if it is an array already, it is returned unmodified.

=> ['key']
_.toPath(['a', 0, 'b']);
=> ['a', 0, 'b'] // (same array)

_.toPath is used internally in has, get, invoke, property, propertyOf and result, as well as in iteratee and all functions that depend on it, in order to normalize deep property paths. You can override _.toPath if you want to customize this behavior, for example to enable Lodash-like string path shorthands. Be advised that altering _.toPath will unavoidably cause some keys to become unreachable; override at your own risk.

// Support dotted path shorthands.
var originalToPath = _.toPath;
  toPath: function(path) {
    return _.isString(path) ? path.split('.') : originalToPath(path);
_.get({a: [{b: 5}]}, 'a.0.b');
=> 5

get_.get(object, path, [default]) source
Returns the specified property of object. path may be specified as a simple key, or as an array of object keys or array indexes, for deep property fetching. If the property does not exist or is undefined, the optional default is returned.

_.get({a: 10}, 'a');
=> 10
_.get({a: [{b: 2}]}, ['a', 0, 'b']);
=> 2
_.get({a: 10}, 'b', 100);
=> 100

has_.has(object, key) source
Does the object contain the given key? Identical to object.hasOwnProperty(key), but uses a safe reference to the hasOwnProperty function, in case it's been overridden accidentally.

_.has({a: 1, b: 2, c: 3}, "b");
=> true

property_.property(path) source
Returns a function that will return the specified property of any passed-in object. path may be specified as a simple key, or as an array of object keys or array indexes, for deep property fetching.

var stooge = {name: 'moe'};
'moe' === _.property('name')(stooge);
=> true

var stooges = {moe: {fears: {worst: 'Spiders'}}, curly: {fears: {worst: 'Moe'}}};
var curlysWorstFear = _.property(['curly', 'fears', 'worst']);
=> 'Moe'

propertyOf_.propertyOf(object) source
Inverse of _.property. Takes an object and returns a function which will return the value of a provided property.

var stooge = {name: 'moe'};
=> 'moe'

matcher_.matcher(attrs) Alias: matches source
Returns a predicate function that will tell you if a passed in object contains all of the key/value properties present in attrs.

var ready = _.matcher({selected: true, visible: true});
var readyToGoList = _.filter(list, ready);

isEqual_.isEqual(object, other) source
Performs an optimized deep comparison between the two objects, to determine if they should be considered equal.

var stooge = {name: 'moe', luckyNumbers: [13, 27, 34]};
var clone  = {name: 'moe', luckyNumbers: [13, 27, 34]};
stooge == clone;
=> false
_.isEqual(stooge, clone);
=> true

isMatch_.isMatch(object, properties) source
Tells you if the keys and values in properties are contained in object.

var stooge = {name: 'moe', age: 32};
_.isMatch(stooge, {age: 32});
=> true

isEmpty_.isEmpty(collection) source
Returns true if collection has no elements. For strings and array-like objects _.isEmpty checks if the length property is 0. For other objects, it returns true if the object has no enumerable own-properties. Note that primitive numbers, booleans and symbols are always empty by this definition.

_.isEmpty([1, 2, 3]);
=> false
=> true

isElement_.isElement(object) source
Returns true if object is a DOM element.

=> true

isArray_.isArray(object) source
Returns true if object is an Array.

(function(){ return _.isArray(arguments); })();
=> false
=> true

isObject_.isObject(value) source
Returns true if value is an Object. Note that JavaScript arrays and functions are objects, while (normal) strings and numbers are not.

=> true
=> false

isArguments_.isArguments(object) source
Returns true if object is an Arguments object.

(function(){ return _.isArguments(arguments); })(1, 2, 3);
=> true
=> false

isFunction_.isFunction(object) source
Returns true if object is a Function.

=> true

isString_.isString(object) source
Returns true if object is a String.

=> true

isNumber_.isNumber(object) source
Returns true if object is a Number (including NaN).

_.isNumber(8.4 * 5);
=> true

isFinite_.isFinite(object) source
Returns true if object is a finite Number.

=> true

=> false

isBoolean_.isBoolean(object) source
Returns true if object is either true or false.

=> false

isDate_.isDate(object) source
Returns true if object is a Date.

_.isDate(new Date());
=> true

isRegExp_.isRegExp(object) source
Returns true if object is a RegExp.

=> true

isError_.isError(object) source
Returns true if object inherits from an Error.

try {
  throw new TypeError("Example");
} catch (o_O) {
=> true

isSymbol_.isSymbol(object) source
Returns true if object is a Symbol.

=> true

isMap_.isMap(object) source
Returns true if object is a Map.

_.isMap(new Map());
=> true

isWeakMap_.isWeakMap(object) source
Returns true if object is a WeakMap.

_.isWeakMap(new WeakMap());
=> true

isSet_.isSet(object) source
Returns true if object is a Set.

_.isSet(new Set());
=> true

isWeakSet_.isWeakSet(object) source
Returns true if object is a WeakSet.

=> true

isArrayBuffer_.isArrayBuffer(object) source
Returns true if object is an ArrayBuffer.

_.isArrayBuffer(new ArrayBuffer(8));
=> true

isDataView_.isDataView(object) source
Returns true if object is a DataView.

_.isDataView(new DataView(new ArrayBuffer(8)));
=> true

isTypedArray_.isTypedArray(object) source
Returns true if object is a TypedArray.

_.isTypedArray(new Int8Array(8));
=> true

isNaN_.isNaN(object) source
Returns true if object is NaN.
Note: this is not the same as the native isNaN function, which will also return true for many other not-number values, such as undefined.

=> true
=> true
=> false

isNull_.isNull(object) source
Returns true if the value of object is null.

=> true
=> false

isUndefined_.isUndefined(value) source
Returns true if value is undefined.

=> true

Utility Functions

noConflict_.noConflict() source
Give control of the global _ variable back to its previous owner. Returns a reference to the Underscore object.

var underscore = _.noConflict();

The _.noConflict function is not present if you use the EcmaScript 6, AMD or CommonJS module system to import Underscore.

identity_.identity(value) source
Returns the same value that is used as the argument. In math: f(x) = x
This function looks useless, but is used throughout Underscore as a default iteratee.

var stooge = {name: 'moe'};
stooge === _.identity(stooge);
=> true

constant_.constant(value) source
Creates a function that returns the same value that is used as the argument of _.constant.

var stooge = {name: 'moe'};
stooge === _.constant(stooge)();
=> true

noop_.noop() source
Returns undefined irrespective of the arguments passed to it. Useful as the default for optional callback arguments.

obj.initialize = _.noop;

times_.times(n, iteratee, [context]) source
Invokes the given iteratee function n times. Each invocation of iteratee is called with an index argument. Produces an array of the returned values.

_.times(3, function(n){ genie.grantWishNumber(n); });

random_.random(min, max) source
Returns a random integer between min and max, inclusive. If you only pass one argument, it will return a number between 0 and that number.

_.random(0, 100);
=> 42

mixin_.mixin(object) source
Allows you to extend Underscore with your own utility functions. Pass a hash of {name: function} definitions to have your functions added to the Underscore object, as well as the OOP wrapper. Returns the Underscore object to facilitate chaining.

  capitalize: function(string) {
    return string.charAt(0).toUpperCase() + string.substring(1).toLowerCase();
=> "Fabio"

iteratee_.iteratee(value, [context]) source
Generates a callback that can be applied to each element in a collection. _.iteratee supports a number of shorthand syntaxes for common callback use cases. Depending upon value's type, _.iteratee will return:

// No value
=> _.identity()

// Function
_.iteratee(function(n) { return n * 2; });
=> function(n) { return n * 2; }

// Object
_.iteratee({firstName: 'Chelsea'});
=> _.matcher({firstName: 'Chelsea'});

// Anything else
=> _.property('firstName');

The following Underscore methods transform their predicates through _.iteratee: countBy, every, filter, find, findIndex, findKey, findLastIndex, groupBy, indexBy, map, mapObject, max, min, partition, reject, some, sortBy, sortedIndex, and uniq

You may overwrite _.iteratee with your own custom function, if you want additional or different shorthand syntaxes:

// Support `RegExp` predicate shorthand.
var builtinIteratee = _.iteratee;
_.iteratee = function(value, context) {
  if (_.isRegExp(value)) return function(obj) { return value.test(obj) };
  return builtinIteratee(value, context);

uniqueId_.uniqueId([prefix]) source
Generate a globally-unique id for client-side models or DOM elements that need one. If prefix is passed, the id will be appended to it.

=> 'contact_104'

escape_.escape(string) source
Escapes a string for insertion into HTML, replacing &, <, >, ", `, and ' characters.

_.escape('Curly, Larry & Moe');
=> "Curly, Larry &amp; Moe"

unescape_.unescape(string) source
The opposite of escape, replaces &amp;, &lt;, &gt;, &quot;, &#x60; and &#x27; with their unescaped counterparts.

_.unescape('Curly, Larry &amp; Moe');
=> "Curly, Larry & Moe"

result_.result(object, property, [defaultValue]) source
If the value of the named property is a function then invoke it with the object as context; otherwise, return it. If a default value is provided and the property doesn't exist or is undefined then the default will be returned. If defaultValue is a function its result will be returned.

var object = {cheese: 'crumpets', stuff: function(){ return 'nonsense'; }};
_.result(object, 'cheese');
=> "crumpets"
_.result(object, 'stuff');
=> "nonsense"
_.result(object, 'meat', 'ham');
=> "ham"

now_.now() source
Returns an integer timestamp for the current time, using the fastest method available in the runtime. Useful for implementing timing/animation functions.

=> 1392066795351

template_.template(templateString, [settings]) source
Compiles JavaScript templates into functions that can be evaluated for rendering. Useful for rendering complicated bits of HTML from JSON data sources. Template functions can both interpolate values, using <%= … %>, as well as execute arbitrary JavaScript code, with <% … %>. If you wish to interpolate a value, and have it be HTML-escaped, use <%- … %>. When you evaluate a template function, pass in a data object that has properties corresponding to the template's free variables. The settings argument should be a hash containing any _.templateSettings that should be overridden.

var compiled = _.template("hello: <%= name %>");
compiled({name: 'moe'});
=> "hello: moe"

var template = _.template("<b><%- value %></b>");
template({value: '<script>'});
=> "<b>&lt;script&gt;</b>"

You can also use print from within JavaScript code. This is sometimes more convenient than using <%= ... %>.

var compiled = _.template("<% print('Hello ' + epithet); %>");
compiled({epithet: "stooge"});
=> "Hello stooge"

If ERB-style delimiters aren't your cup of tea, you can change Underscore's template settings to use different symbols to set off interpolated code. Define an interpolate regex to match expressions that should be interpolated verbatim, an escape regex to match expressions that should be inserted after being HTML-escaped, and an evaluate regex to match expressions that should be evaluated without insertion into the resulting string. Note that if part of your template matches more than one of these regexes, the first will be applied by the following order of priority: (1) escape, (2) interpolate, (3) evaluate. You may define or omit any combination of the three. For example, to perform Mustache.js-style templating:

_.templateSettings = {
  interpolate: /\{\{(.+?)\}\}/g

var template = _.template("Hello {{ name }}!");
template({name: "Mustache"});
=> "Hello Mustache!"

By default, template places the values from your data in the local scope via the with statement. However, you can specify a single variable name with the variable setting. This can significantly improve the speed at which a template is able to render.

_.template("Using 'with': <%= data.answer %>", {variable: 'data'})({answer: 'no'});
=> "Using 'with': no"

Precompiling your templates can be a big help when debugging errors you can't reproduce. This is because precompiled templates can provide line numbers and a stack trace, something that is not possible when compiling templates on the client. The source property is available on the compiled template function for easy precompilation.

  JST.project = <%= _.template(jstText).source %>;

Object-Oriented Style

You can use Underscore in either an object-oriented or a functional style, depending on your preference. The following two lines of code are identical ways to double a list of numbers. source, source

_.map([1, 2, 3], function(n){ return n * 2; });
_([1, 2, 3]).map(function(n){ return n * 2; });


Calling chain will cause all future method calls to return wrapped objects. When you've finished the computation, call value to retrieve the final value. Here's an example of chaining together a map/flatten/reduce, in order to get the word count of every word in a song.

var lyrics = [
  {line: 1, words: "I'm a lumberjack and I'm okay"},
  {line: 2, words: "I sleep all night and I work all day"},
  {line: 3, words: "He's a lumberjack and he's okay"},
  {line: 4, words: "He sleeps all night and he works all day"}

  .map(function(line) { return line.words.split(' '); })
  .reduce(function(counts, word) {
    counts[word] = (counts[word] || 0) + 1;
    return counts;
  }, {})

=> {lumberjack: 2, all: 4, night: 2 ... }

In addition, the Array prototype's methods are proxied through the chained Underscore object, so you can slip a reverse or a push into your chain, and continue to modify the array.

chain_.chain(obj) source
Returns a wrapped object. Calling methods on this object will continue to return wrapped objects until value is called.

var stooges = [{name: 'curly', age: 25}, {name: 'moe', age: 21}, {name: 'larry', age: 23}];
var youngest = _.chain(stooges)
  .sortBy(function(stooge){ return stooge.age; })
  .map(function(stooge){ return stooge.name + ' is ' + stooge.age; })
=> "moe is 21"

value_.chain(obj).value() source
Extracts the value of a wrapped object.

_.chain([1, 2, 3]).reverse().value();
=> [3, 2, 1]

Underscore.lua, a Lua port of the functions that are applicable in both languages. Includes OOP-wrapping and chaining. (source)

Dollar.swift, a Swift port of many of the Underscore.js functions and more. (source)

Underscore.m, an Objective-C port of many of the Underscore.js functions, using a syntax that encourages chaining. (source)

_.m, an alternative Objective-C port that tries to stick a little closer to the original Underscore.js API. (source)

Underscore.php, a PHP port of the functions that are applicable in both languages. Tailored for PHP 5.4 and made with data-type tolerance in mind. (source)

Underscore-perl, a Perl port of many of the Underscore.js functions, aimed at on Perl hashes and arrays. (source)

Underscore.cfc, a Coldfusion port of many of the Underscore.js functions. (source)

Underscore.string, an Underscore extension that adds functions for string-manipulation: trim, startsWith, contains, capitalize, reverse, sprintf, and more.

Underscore-java, a java port of the functions that are applicable in both languages. Includes OOP-wrapping and chaining. (source)

Ruby's Enumerable module.

Prototype.js, which provides JavaScript with collection functions in the manner closest to Ruby's Enumerable.

Oliver Steele's Functional JavaScript, which includes comprehensive higher-order function support as well as string lambdas.

Michael Aufreiter's Data.js, a data manipulation + persistence library for JavaScript.

Python's itertools.

PyToolz, a Python port that extends itertools and functools to include much of the Underscore API.

Funcy, a practical collection of functional helpers for Python, partially inspired by Underscore.


On the use of < in Underscore
Underscore functions that depend on ordering, such as _.sortBy and _.sortedIndex, use JavaScript’s built-in relational operators, specifically the “less than” operator <. It is important to understand that these operators are only meaningful for numbers and strings. You can throw any value to them, but JavaScript will convert the operands to string or number first before performing the actual comparison. If you pass an operand that cannot be meaningfully converted to string or number, it ends up being NaN by default. This value is unsortable.

Ideally, the values that you are sorting should either be all (meaningfully convertible to) strings or all (meaningfully convertible to) numbers. If this is not the case, you have two options:

Change Log

1.13.6September 24, 2022DiffDocs
Hotfix for version 1.13.5 to remove a postinstall script from the package.json, which unexpectedly broke many people's builds.

1.13.5September 23, 2022DiffDocs

1.13.4June 2, 2022DiffDocs

1.13.3April 23, 2022DiffDocs

1.13.2December 16, 2021DiffDocs

1.13.1April 15, 2021DiffDocs

1.13.0April 9, 2021DiffDocs

1.13.0-3March 31, 2021DiffDocs

1.13.0-2March 15, 2021DiffDocs

1.12.1March 15, 2021DiffDocs

1.13.0-1March 11, 2021DiffDocs

1.13.0-0March 9, 2021DiffDocs

1.12.0November 24, 2020DiffDocs

1.11.0August 28, 2020DiffDocsArticle

1.10.2March 30, 2020DiffDocs

1.10.1March 30, 2020DiffDocs

1.10.0March 30, 2020DiffDocs

1.9.2Jan 6, 2020DiffDocs

1.9.1May 31, 2018DiffDocs

1.9.0April 18, 2018DiffDocs

1.8.3April 2, 2015DiffDocs

1.8.2Feb. 22, 2015DiffDocs

1.8.1Feb. 19, 2015DiffDocs

1.8.0Feb. 19, 2015DiffDocs

1.7.0August 26, 2014DiffDocs

1.6.0February 10, 2014DiffDocs

1.5.2September 7, 2013DiffDocs

1.5.1July 8, 2013DiffDocs

1.5.0July 6, 2013DiffDocs

1.4.4January 30, 2013DiffDocs

1.4.3December 4, 2012DiffDocs

1.4.2October 6, 2012DiffDocs

1.4.1October 1, 2012DiffDocs

1.4.0September 27, 2012DiffDocs

1.3.3April 10, 2012DiffDocs

1.3.1January 23, 2012DiffDocs

1.3.0January 11, 2012DiffDocs

1.2.4January 4, 2012DiffDocs

1.2.3December 7, 2011DiffDocs

1.2.2November 14, 2011DiffDocs

1.2.1October 24, 2011DiffDocs

1.2.0October 5, 2011DiffDocs

1.1.7July 13, 2011DiffDocs
Added _.groupBy, which aggregates a collection into groups of like items. Added _.union and _.difference, to complement the (re-named) _.intersection. Various improvements for support of sparse arrays. _.toArray now returns a clone, if directly passed an array. _.functions now also returns the names of functions that are present in the prototype chain.

1.1.6April 18, 2011DiffDocs
Added _.after, which will return a function that only runs after first being called a specified number of times. _.invoke can now take a direct function reference. _.every now requires an iterator function to be passed, which mirrors the ES5 API. _.extend no longer copies keys when the value is undefined. _.bind now errors when trying to bind an undefined value.

1.1.5March 20, 2011DiffDocs
Added an _.defaults function, for use merging together JS objects representing default options. Added an _.once function, for manufacturing functions that should only ever execute a single time. _.bind now delegates to the native ES5 version, where available. _.keys now throws an error when used on non-Object values, as in ES5. Fixed a bug with _.keys when used over sparse arrays.

1.1.4January 9, 2011DiffDocs
Improved compliance with ES5's Array methods when passing null as a value. _.wrap now correctly sets this for the wrapped function. _.indexOf now takes an optional flag for finding the insertion index in an array that is guaranteed to already be sorted. Avoiding the use of .callee, to allow _.isArray to work properly in ES5's strict mode.

1.1.3December 1, 2010DiffDocs
In CommonJS, Underscore may now be required with just:
var _ = require("underscore"). Added _.throttle and _.debounce functions. Removed _.breakLoop, in favor of an ES5-style un-break-able each implementation — this removes the try/catch, and you'll now have better stack traces for exceptions that are thrown within an Underscore iterator. Improved the isType family of functions for better interoperability with Internet Explorer host objects. _.template now correctly escapes backslashes in templates. Improved _.reduce compatibility with the ES5 version: if you don't pass an initial value, the first item in the collection is used. _.each no longer returns the iterated collection, for improved consistency with ES5's forEach.

1.1.2October 15, 2010DiffDocs
Fixed _.contains, which was mistakenly pointing at _.intersect instead of _.include, like it should have been. Added _.unique as an alias for _.uniq.

1.1.1October 5, 2010DiffDocs
Improved the speed of _.template, and its handling of multiline interpolations. Ryan Tenney contributed optimizations to many Underscore functions. An annotated version of the source code is now available.

1.1.0August 18, 2010DiffDocs
The method signature of _.reduce has been changed to match the ES5 signature, instead of the Ruby/Prototype.js version. This is a backwards-incompatible change. _.template may now be called with no arguments, and preserves whitespace. _.contains is a new alias for _.include.

1.0.4June 22, 2010DiffDocs
Andri Möll contributed the _.memoize function, which can be used to speed up expensive repeated computations by caching the results.

1.0.3June 14, 2010DiffDocs
Patch that makes _.isEqual return false if any property of the compared object has a NaN value. Technically the correct thing to do, but of questionable semantics. Watch out for NaN comparisons.

1.0.2March 23, 2010DiffDocs
Fixes _.isArguments in recent versions of Opera, which have arguments objects as real Arrays.

1.0.1March 19, 2010DiffDocs
Bugfix for _.isEqual, when comparing two objects with the same number of undefined keys, but with different names.

1.0.0March 18, 2010DiffDocs
Things have been stable for many months now, so Underscore is now considered to be out of beta, at 1.0. Improvements since 0.6 include _.isBoolean, and the ability to have _.extend take multiple source objects.

0.6.0February 24, 2010DiffDocs
Major release. Incorporates a number of Mile Frawley's refactors for safer duck-typing on collection functions, and cleaner internals. A new _.mixin method that allows you to extend Underscore with utility functions of your own. Added _.times, which works the same as in Ruby or Prototype.js. Native support for ES5's Array.isArray, and Object.keys.

0.5.8January 28, 2010DiffDocs
Fixed Underscore's collection functions to work on NodeLists and HTMLCollections once more, thanks to Justin Tulloss.

0.5.7January 20, 2010DiffDocs
A safer implementation of _.isArguments, and a faster _.isNumber,
thanks to Jed Schmidt.

0.5.6January 18, 2010DiffDocs
Customizable delimiters for _.template, contributed by Noah Sloan.

0.5.5January 9, 2010DiffDocs
Fix for a bug in MobileSafari's OOP-wrapper, with the arguments object.

0.5.4January 5, 2010DiffDocs
Fix for multiple single quotes within a template string for _.template. See: Rick Strahl's blog post.

0.5.2January 1, 2010DiffDocs
New implementations of isArray, isDate, isFunction, isNumber, isRegExp, and isString, thanks to a suggestion from Robert Kieffer. Instead of doing Object#toString comparisons, they now check for expected properties, which is less safe, but more than an order of magnitude faster. Most other Underscore functions saw minor speed improvements as a result. Evgeniy Dolzhenko contributed _.tap, similar to Ruby 1.9's, which is handy for injecting side effects (like logging) into chained calls.

0.5.1December 9, 2009DiffDocs
Added an _.isArguments function. Lots of little safety checks and optimizations contributed by Noah Sloan and Andri Möll.

0.5.0December 7, 2009DiffDocs
[API Changes] _.bindAll now takes the context object as its first parameter. If no method names are passed, all of the context object's methods are bound to it, enabling chaining and easier binding. _.functions now takes a single argument and returns the names of its Function properties. Calling _.functions(_) will get you the previous behavior. Added _.isRegExp so that isEqual can now test for RegExp equality. All of the "is" functions have been shrunk down into a single definition. Karl Guertin contributed patches.

0.4.7December 6, 2009DiffDocs
Added isDate, isNaN, and isNull, for completeness. Optimizations for isEqual when checking equality between Arrays or Dates. _.keys is now 25%–2X faster (depending on your browser) which speeds up the functions that rely on it, such as _.each.

0.4.6November 30, 2009DiffDocs
Added the range function, a port of the Python function of the same name, for generating flexibly-numbered lists of integers. Original patch contributed by Kirill Ishanov.

0.4.5November 19, 2009DiffDocs
Added rest for Arrays and arguments objects, and aliased first as head, and rest as tail, thanks to Luke Sutton's patches. Added tests ensuring that all Underscore Array functions also work on arguments objects.

0.4.4November 18, 2009DiffDocs
Added isString, and isNumber, for consistency. Fixed _.isEqual(NaN, NaN) to return true (which is debatable).

0.4.3November 9, 2009DiffDocs
Started using the native StopIteration object in browsers that support it. Fixed Underscore setup for CommonJS environments.

0.4.2November 9, 2009DiffDocs
Renamed the unwrapping function to value, for clarity.

0.4.1November 8, 2009DiffDocs
Chained Underscore objects now support the Array prototype methods, so that you can perform the full range of operations on a wrapped array without having to break your chain. Added a breakLoop method to break in the middle of any Underscore iteration. Added an isEmpty function that works on arrays and objects.

0.4.0November 7, 2009DiffDocs
All Underscore functions can now be called in an object-oriented style, like so: _([1, 2, 3]).map(...);. Original patch provided by Marc-André Cournoyer. Wrapped objects can be chained through multiple method invocations. A functions method was added, providing a sorted list of all the functions in Underscore.

0.3.3October 31, 2009DiffDocs
Added the JavaScript 1.8 function reduceRight. Aliased it as foldr, and aliased reduce as foldl.

0.3.2October 29, 2009DiffDocs
Now runs on stock Rhino interpreters with: load("underscore.js"). Added identity as a utility function.

0.3.1October 29, 2009DiffDocs
All iterators are now passed in the original collection as their third argument, the same as JavaScript 1.6's forEach. Iterating over objects is now called with (value, key, collection), for details see _.each.

0.3.0October 29, 2009DiffDocs
Added Dmitry Baranovskiy's comprehensive optimizations, merged in Kris Kowal's patches to make Underscore CommonJS and Narwhal compliant.

0.2.0October 28, 2009DiffDocs
Added compose and lastIndexOf, renamed inject to reduce, added aliases for inject, filter, every, some, and forEach.

0.1.1October 28, 2009DiffDocs
Added noConflict, so that the "Underscore" object can be assigned to other variables.

0.1.0October 28, 2009Docs
Initial release of Underscore.js.

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