JavaScript Prototype & this

prototype_this.js

/* Important concepts about prototypes and this */

// Problem Statement: console.log('hello'.repeatify(3)); Should print hellohellohello.

String.prototype.times =  String.prototype.times || function(number) {
  var str = '';
  for (var i = 0; i < number; i++) {
    str += this;
  }
  return str;
};


// Scope of this

var fullname = 'John Doe';
var obj = {
   fullname: 'Colin Ihrig'
   prop: {
      fullname: 'Aurelio De Rosa',
      getFullname: function() {
         return this.fullname;
      }
   }
};
 
console.log(obj.prop.getFullname());  // Aurelio De Rosa
 
var test = obj.prop.getFullname; 
console.log(test());                  // John Doe, test implicitly assigned to the global object therefore calls the global fn.