import restArguments from './restArguments.js';
import now from './now.js';import restArguments from './restArguments.js';
import now from './now.js';When a sequence of calls of the returned function ends, the argument
function is triggered. The end of a sequence is defined by the wait
parameter. If immediate is passed, the argument function will be
triggered at the beginning of the sequence instead of at the end.
export default function debounce(func, wait, immediate) {
var timeout, previous, args, result, context;
var later = function() {
var passed = now() - previous;
if (wait > passed) {
timeout = setTimeout(later, wait - passed);
} else {
timeout = null;
if (!immediate) result = func.apply(context, args);This check is needed because func can recursively invoke debounced.
if (!timeout) args = context = null;
}
};
var debounced = restArguments(function(_args) {
context = this;
args = _args;
previous = now();
if (!timeout) {
timeout = setTimeout(later, wait);
if (immediate) result = func.apply(context, args);
}
return result;
});
debounced.cancel = function() {
clearTimeout(timeout);
timeout = args = context = null;
};
return debounced;
}