debouncing in javascript code example

Example 1: js throttle function

function throttle (callback, limit) {
    var wait = false;                  // Initially, we're not waiting
    return function () {               // We return a throttled function
        if (!wait) {                   // If we're not waiting
            callback.call();           // Execute users function
            wait = true;               // Prevent future invocations
            setTimeout(function () {   // After a period of time
                wait = false;          // And allow future invocations
            }, limit);
        }
    }
}
// Usage Example:
// On scroll, allow function to run at most 1 time per 100ms
window.addEventListener("scroll", throttle(function(){
  /*stuff to be throttled*/
}, 100));

Example 2: js debounce

// 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);
	};
};

// Usage:
var myEfficientFn = debounce(function() {
	// All the taxing stuff you do
}, 250);

window.addEventListener('resize', myEfficientFn);

Example 3: javascript debounce function

// This is from David Walshes Blog Post 
// https://davidwalsh.name/javascript-debounce-function
// A very simplified but effective version of Underscores debounce function
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);
	};
};