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Extending JavaScript Arrays - Part 2

Discussion in 'JavaScript and AJAX' started by pradeep, Jul 5, 2006.

  1. pradeep

    pradeep Team Leader

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    Continuation of [thread=606]Extending JavaScript Arrays[/thread].

    Some more functions to extend the array manipulation capabilty of JavaScript.

    Code:
    /* Shuffles the Array elements randomly */
     Array.prototype.shuffle=function()
     {
         var i=this.length,j,t;
         while(i--)
         {
             j=Math.floor((i+1)*Math.random());
             t=arr[i];
             arr[i]=arr[j];
             arr[j]=t;
         }
     }
     
     /* Removes redundant elements from the array */
     Array.prototype.unique=function()
     {
         var a=[],i;
         this.sort();
         for(i=0;i<this.length;i++)
         {
             if(this[i]!==this[i+1])
             {
                 a[a.length]=this[i];
             }
         }
         return a;
     }
     
     /* Returns the index of the element matched from the behind */
     Array.prototype.lastIndexOf=function(n)
     {
         var i=this.length;
         while(i--)
         {
             if(this[i]===n)
             {
                 return i;
             }
         }
         return -1;
     }
     

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