Object-Oriented JavaScript

Exercises

1. Look at this code:

   function F() {
     function C() { 
       return this;
     } 
     return C();
   } 
   var o = new F(); 

   The value of this refers to the global object or the object o?

2. What's the result of executing this piece of code?

   function C(){ 
     this.a = 1;
     return false; 
   }
   console.log(typeof new C());

3. What's the result of executing the following piece of code?

   >>> c = [1, 2, [1, 2]];
   >>> c.sort();
   >>> c.join('--'); 
   >>> console.log(c); 

4. Imagine the String() constructor didn't exist. Create a constructor function MyString() that acts like String() as closely as possible. You're not allowed to use any built-in string methods or properties, and remember that String() doesn't exist. You can use this code to test your constructor:

   >>> var s = new MyString('hello'); >>> ...