javascript-patterns/general-patterns/function-declarations.html at master · kuanjava/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: Function Declarations
			 * Description: creating anonymous functions and assigning them to a variable
			 */

			// antipattern
			function getData() {
			}


			// preferred
			/* Benefits:
			 * 1. Makes it easier to understand "functions as an object".
			 * 2. It enforces good semicolon habits.
			 * 3. Doesn't have much of the baggage traditionally associated with functions and scope.
			 */
			var getData = function () {
			};


			// named function expression
			/* Benefits:
			 * 1. Provides the debugger with an explicit function name: helps stack inspection.
			 * 2. Allows recursive functions: getData can call itself.
			 * Issues:
			 * 1. Can break IE, coffeescript doesn't do function names:
			 *    https://github.com/jashkenas/coffee-script/issues/366
			 */
			var getData = function getData () {
			};

                        // named function expression + 'F'
			/* Benefits:
			 * 1. Get's rid of (anonymous funciton) in stack traces
			 * 2. Recurse by calling the name + 'F'
			 * 3. Doesn't break an IE (well, unless there's a function name collision of the sort described here: https://github.com/jashkenas/coffee-script/issues/366#issuecomment-242134)
			 */
			var getData = function getDataF () {
			};


			// References
			// http://ejohn.org/blog/javascript-as-a-first-language/
			// http://kangax.github.com/nfe/
		</script>
	</body>
</html>