thegreatape · September 27, 2010 17:51 · polotek · Sep 27, 2010
diff --git a/gistfile1.js b/gistfile1.js
 var foo = 'bar';
 var a = function(){ 
  console.log(foo); 
 }
 var b = function(){ 
  console.log(foo); 
  var foo = 'blarg';
 }

 a()
 // 'bar' is logged. no surprises.

 b()
 // undefined is logged! defining a var *later* in the function
 // prevents foo from being looked up in the closure scope
	var foo = 'bar';
	var a = function(){
	console.log(foo);
	}
	var b = function(){
	console.log(foo);
	var foo = 'blarg';
	}

	a()
	// 'bar' is logged. no surprises.

	b()
	// undefined is logged! defining a var later in the function
	// prevents foo from being looked up in the closure scope