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debounce.js
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debounce.js
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// Returns a function, that, as long as it continues to be invoked, will not
// be triggered. The function will be called after it stops being called for
// N milliseconds. If `immediate` is passed, trigger the function on the
// leading edge, instead of the trailing.
function debounce(func, wait, immediate) {
var timeout;
return function() {
var context = this,
args = arguments;
var later = function() {
timeout = null;
if (!immediate) func.apply(context, args);
};
var callNow = immediate && !timeout;
clearTimeout(timeout);
timeout = setTimeout(later, wait);
if (callNow) func.apply(context, args);
};
};
// Alternate / Improved method
// https://github.com/rhysbrettbowen/debounce
var debounce = function(func, wait) {
var timeout, args, context, timestamp;
return function() {
context = this;
args = [].slice.call(arguments, 0);
timestamp = new Date();
var later = function() {
var last = (new Date()) - timestamp;
if (last < wait) {
timeout = setTimeout(later, wait - last);
} else {
timeout = null;
func.apply(context, args);
}
};
if (!timeout) {
timeout = setTimeout(later, wait);
}
}
};
// Usage
var myEfficientFn = debounce(function() {
// All the taxing stuff you do
}, 250);
window.addEventListener('resize', myEfficientFn);