javascript-patterns/function-patterns/returning-functions.html at master · sunmi/javascript-patterns · GitHub

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<!doctype html>
<html lang="en">
	<head>
		<title>JavaScript Patterns</title>
		<meta charset="utf-8">
	</head>
	<body>
		<script>
			/* Title: Returning functions
			 Description: one function returns another function or create another function on-demand
			 */

			var setup = function () {
				console.log(1);
				return function () {
					console.log(2);
				};
			};
			// using the setup function
			var my = setup(); // alerts 1
			my(); // alerts 2

			var setup = function (count) {
				var count = 0;
				return function () {
					return (count += 1);
				};
			};
			// usage
			var next = setup();
			//next(); // returns 1
			//next(); // returns 2
			//next(); // returns 3

			// reference
			// http://www.jspatterns.com/
			// http://shop.oreilly.com/product/9780596806767.do?sortby=publicationDate
		</script>
	</body>
</html>