Javascript String reverse() method

//Just like you can add methods to your own constructor, you can also add methods and properties to built in classes in JavaScript like Arrays and Objects.

//Add a reverse method to the String 'class' so that every instance of String can call reverse and reverse itself.
  
  //code here//ww w . j  a v a2  s.c o  m

String.prototype.reverse =  function() {
 var strArr = this.split("") || [];
 
 var reverseStr = [];
 
 for(var i = strArr.length-1; i >=0; i--) {
  reverseStr.push(strArr[i]);
 }
 
 return reverseStr.join("");
}