completed prototypal-inheritance

adaau · adaau · commit 654c9ad940cb · 2015-10-07T23:13:28.000+08:00
diff --git a/topics/about_prototypal_inheritance.js b/topics/about_prototypal_inheritance.js
@@ -16,17 +16,17 @@ Mammal.prototype = {
 
 test("defining a 'class'", function() {
     var eric  = new Mammal("Eric");
-    equal(__, eric.sayHi(), 'what will Eric say?');
+    equal("Hello, my name is Eric", eric.sayHi(), 'what will Eric say?');
 });
 
 // add another function to the Mammal 'type' that uses the sayHi function
 Mammal.prototype.favouriteSaying = function() {
-    return this.name + "'s favourite saying is " + this.sayHi(); 
+    return this.name + "'s favourite saying is " + this.sayHi();
 }
 
 test("more functions", function() {
     var bobby = new Mammal("Bobby");
-    equal(__, bobby.favouriteSaying(), "what is Bobby's favourite saying?"); 
+    equal("Bobby's favourite saying is \"Hello, my name is Bobby\"", bobby.favouriteSaying(), "what is Bobby's favourite saying?");
 });
 
 test("calling functions added to a prototype after an object was created", function() {
@@ -36,26 +36,26 @@ test("calling functions added to a prototype after an object was created", funct
     };
     // the following statement asks the paul object to call a function that was added
     // to the Mammal prototype after paul was constructed.
-    equal(__, paul.numberOfLettersInName(), "how long is Paul's name?");
+    equal(undefined, paul.numberOfLettersInName(), "how long is Paul's name?");
 });
 
-// helper function for inheritance. 
+// helper function for inheritance.
 // From https://developer.mozilla.org/en/JavaScript/Guide/Inheritance_Revisited
-function extend(child, supertype){  
-    child.prototype = supertype.prototype;  
-} 
+function extend(child, supertype){
+    child.prototype = supertype.prototype;
+}
 
 // "Subclass" Mammal
 function Bat(name, wingspan) {
     Mammal.call(this, name);
     this.wingspan = wingspan;
-}	
+}
 
 // configure inheritance
 extend(Bat, Mammal);
 
 test("Inheritance", function() {
     var lenny = new Bat("Lenny", "1.5m");
-    equal(__, lenny.sayHi(), "what does Lenny say?");
-    equal(__, lenny.wingspan, "what is Lenny's wingspan?");
+    equal("Hello, my name is Lenny", lenny.sayHi(), "what does Lenny say?");
+    equal("1.5m", lenny.wingspan, "what is Lenny's wingspan?");
 });
