javascript questoins

formigone · formigone · commit e3c86efb34f0 · 2015-08-11T21:31:17.000-03:00
diff --git a/javascript-questions/function-expressions-vs-function-declarations.js b/javascript-questions/function-expressions-vs-function-declarations.js
@@ -0,0 +1,87 @@
+// Declaration:
+// function <name> ([parameters...]) {
+//    <body>
+// }
+
+// Expression:
+// var varName = function [name]([parameters...]){
+//    <body>
+// };
+
+// Runtime difference:
+// 1. Hoisting
+(function(){
+	var num = randInt();
+
+	function randInt(){
+	   return Math.random() * Number.MAX_SAFE_INTEGER | 0;
+	}
+
+	return num;
+}());
+
+(function(){
+	var num = randInt();
+
+	var randInt = function(){
+		return Math.random() * Number.MAX_SAFE_INTEGER | 0;
+	};
+
+	return num;
+}());
+
+
+// var num;
+// var randInt;
+//
+// num = randInt();
+// randInt = function(){ ... }
+
+// 2. Stack trace
+function func1(cb, shouldThrow){
+	return cb(shouldThrow);
+}
+
+function funcDec(shouldThrow) {
+	if (shouldThrow) {
+		throw new Error('error @funcDec')
+	}
+
+	return 'funcDec';
+}
+
+var funcExp = function(shouldThrow){
+	if (shouldThrow) {
+		throw new Error('error @funxExp')
+	}
+
+	return 'funxExp';
+};
+
+setTimeout(function(){
+	func1(funcDec, true);
+}, 0);
+
+setTimeout(function(){
+	func1(funcExp, true);
+}, 1000);
+
+setTimeout(function(){
+	func1(function (shouldThrow){
+		if (shouldThrow) {
+			throw new Error('error @funcAnon')
+		}
+
+		return 'funcAnon';
+	}, true);
+}, 2000);
+
+setTimeout(function(){
+	func1(function funcExpNamed(shouldThrow){
+		if (shouldThrow) {
+			throw new Error('error @funcExpNamed')
+		}
+
+		return 'funcExpNamed';
+	}, true);
+}, 3000);
