Hoisting - function declarations vs function expressions

Hoisting - function declarations vs function expressions.js

/* Hoisting - function declarations vs function expressions */
function foo () { alert( 'global foo' ); }
function bar () { alert( 'global bar' ); }

function hoistMe () {

	console.log( typeof foo ); // "function"
	console.log( typeof bar ); // "undefined"
	
	foo(); // alerts "local foo"
	bar(); // throws TypeError: bar is not a function
	
	// ## function declaration ##:
	// variable 'foo' AND its implementation get hoisted
	function foo () { alert( 'local foo' ); }
	
	// ## function expression ##:
	// only variable 'bar' gets hoisted, NOT the implementation
	var bar = function () { alert('local bar'); };

}