Add valueOf example

code-warrior · code-warrior · commit a8a822486705 · 2017-09-21T15:04:41.000-04:00
diff --git a/examples/valueOf/index.html b/examples/valueOf/index.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+   <meta charset="utf-8">
+   <title>valueOf Example</title>
+   <link rel="stylesheet" href="http://code-warrior.github.io/styles/reset.css">
+   <link rel="stylesheet" href="http://code-warrior.github.io/styles/base.css">
+</head>
+<body>
+   <h1><code>valueOf</code> Example</h1>
+   <p>Open your console to see this program’s output from the file <a href="valueOf.js">valueOf.js</a></p>
+   <script src="valueOf.js"></script>
+</body>
+</html>
diff --git a/examples/valueOf/valueOf.js b/examples/valueOf/valueOf.js
@@ -0,0 +1,24 @@
+/*jslint es6, single, devel, this */
+/*eslint no-console: ["error", { allow: ["log"] }] */
+
+'use strict';
+
+// Construct the Dog object
+function Dog(name, breed) {
+    this.name = name;
+    this.breed = breed;
+}
+
+// Create a new Dog instance named dog
+let dog = new Dog(`Spot`, `mutt`);
+
+// Retrieve the object itself
+console.log(dog.valueOf()); // Dog {name: "Spot", breed: "mutt"}
+
+// Using prototypal inheritance, over-ride how valueOf behaves, returning the name
+// of the dog
+Dog.prototype.valueOf = function () {
+    return this.name;
+};
+
+console.log(dog.valueOf()); // Spot
