Some concepts about JS object.

ferdinandderamos · ferdinandderamos · commit 42f64b76385b · 2014-09-05T03:41:51.000Z
diff --git a/about_objects.js b/about_objects.js
@@ -0,0 +1,64 @@
+// About objects.
+
+var rabbit = {};
+
+rabbit.speak = function(line) {
+    console.log("The rabbit says '" + line + "'");
+};
+rabbit.speak("I'm alive.");
+
+// Special variable this.
+function speak(line) {
+    console.log("The " + this.type + " rabbit says '" + line + "'");
+}
+
+var whiteRabbit = {type: "white", speak: speak};
+var fatRabbit = {type: "fat", speak: speak};
+
+whiteRabbit.speak("Oh my ears and whiskers, how late it's getting!");
+fatRabbit.speak("I could sure use a carrot right now.");
+
+speak.apply(fatRabbit, ["Burp!"]);
+speak.call({type: "old"}, "私は日本語を話すことができます。");
+
+var empty = {};
+console.log(empty.toString);
+console.log(empty.toString());
+
+// Creating an object with specific prototype.
+var protoRabbit = {
+  speak: function(line) {
+      console.log("The " + this.type + " rabbit says '" + line + "'");
+  }
+};
+
+var killerRabbit = Object.create(protoRabbit);
+killerRabbit.type = "killer";
+killerRabbit.speak("SKREEEE!");
+
+// Object constructor.
+
+function Rabbit(type) {
+    this.type = type;
+}
+
+var killerRabbit = new Rabbit("killer");
+var blackRabbit = new Rabbit("black");
+
+console.log(blackRabbit.type);
+
+Rabbit.prototype.speak = function(line) {
+                             console.log("The " + this.type + " rabbit says '" + line + "'");
+                         };
+blackRabbit.speak("Doom...");
+
+// Overriding an object's derived properties.
+
+Rabbit.prototype.teeth = "small";
+console.log(killerRabbit.teeth);
+killerRabbit.teeth = "long, sharp, and bloody";
+console.log(killerRabbit.teeth);
+
+console.log([1, 2].toString());
+console.log(([1, 2].toString()).length);
+
