ES6 parameter handling example

loiane · loiane · commit a183471f93f1 · 2016-01-17T11:29:08.000-02:00
diff --git a/chapter01/14-ES6ParameterHandling.html b/chapter01/14-ES6ParameterHandling.html
@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<html>
+<head lang="en">
+    <meta charset="UTF-8">
+    <title></title>
+</head>
+<body>
+<script type="text/javascript" src="14-ES6ParameterHandling.js"></script>
+</body>
+</html>
diff --git a/chapter01/14-ES6ParameterHandling.js b/chapter01/14-ES6ParameterHandling.js
@@ -0,0 +1,37 @@
+//******* EcmaScript 6: Default Parameter Values
+function sum (x = 1, y = 2, z = 3) {
+    return x + y + z
+};
+console.log(sum(4,2)); //outpus 9
+
+//function above is the same as
+function sum2 (x, y, z) {
+    if (x === undefined)
+        x = 1;
+    if (y === undefined)
+        y = 2;
+    if (z === undefined)
+        z = 3;
+    return x + y + z;
+};
+console.log(sum2(4,2)); //outpus 10
+
+//******* EcmaScript 6: spread operator ('...')
+var params = [3, 4, 5];
+console.log(sum(...params));
+
+var numbers = [1, 2, ...params]; //pushing values into array
+console.log(numbers);
+
+//******* EcmaScript 6: rest parameter ('...')
+function restParamaterFunction (x, y, ...a) {
+    return (x + y) * a.length;
+}
+console.log(restParamaterFunction(1, 2, "hello", true, 7)); // outputs 9;
+
+//code above is the same as ES5:
+function restParamaterFunction (x, y) {
+    var a = Array.prototype.slice.call(arguments, 2);
+    return (x + y) * a.length;
+};
+console.log(restParamaterFunction2(1, 2, "hello", true, 7));
