debounce polyfill

1
2// This is from David Walshes Blog Post 
3// https://davidwalsh.name/javascript-debounce-function
4// A very simplified but effective version of Underscores debounce function
5function debounce(func, wait, immediate) {
6	var timeout;
7	return function() {
8		var context = this, args = arguments;
9		var later = function() {
10			timeout = null;
11			if (!immediate) func.apply(context, args);
12		};
13		var callNow = immediate && !timeout;
14		clearTimeout(timeout);
15		timeout = setTimeout(later, wait);
16		if (callNow) func.apply(context, args);
17	};
18};

1const debounce = (func, delay) => {
2    let clearTimer;
3    return function() {
4        const context = this;
5        const args = arguments;
6        clearTimeout(clearTimer);
7        clearTimer = setTimeout(() => func.apply(context, args), delay);
8    }
9}