Extend Prototype Array

JS :: Extend Prototype Array.js

if(!Array.prototype.inArray){
    Array.prototype.inArray = function (elem){
        for(i=0, j = this.length; i < j; i++){
            if(this[i] == elem) return true;
        }
        return false;
    } // end Array.prototype.inArray
}


//  example
//  >>> var x = [1,2,3,4];
//  >>> x.inArray(4);
// true


// ======================================================

if(!Array.prototype.randomItem){
    Array.prototype.randomItem = function(){
        return this[Math.floor(Math.random() * this.length)];
    }
}

//  example
//  >>> items = [1,2,3,4,5,6,7,8,9];
//  >>> items.randomItem();
//  5



//======================================================
//  This function shuffles (randomizes the order of the elements in) an array.

if(!Array.prototype.shuffles){
    Array.prototype.shuffles = function(){
        for(var j, x, i = this.length; i; j = parseInt(Math.random() * i), x = this[--i], this[i] = this[j], this[j] = x);
    }
}

//  example
//  >>> items = [1,2,3,4,5,6,7,8,9];
//  >>> items.shuffles();
//  >>> items
//  [9,8,5,6,3,4,7,2,1]


//======================================================

if(! Array.prototype.diff){
     Array.prototype.diff = function(c, m){
        var d = [], e = -1, h, i, j, k;
        for(i = c.length, k = this.length; i--;){
            for(j = k; j && (h = c[i] !== this[--j]););
            h && (d[++e] = m ? i : c[i]);
        }
        return d;
    }
}

//  example
//  >>> var x = [1,2,3,67];
//  >>> x.diff( [1,2,6,5]);
//  >>> [6,5]



//======================================================
if(!Array.prototype.removeDuplicated){
     Array.prototype.removeDuplicated = function(s){
        var p, i, j;

       for(i = this.length; i;){
            for(p = --i; p > 0;)
                if(this[i] === this[--p]){
                    for(j = p; p-- && this[i] === this[p];);
                    i -= this.splice(p + 1, j - p).length;
                }
        }
        
        if(s){
            flag = true;
            for(var i = 0, j = this.length; i < j; i++){
                if(isNaN(parseFloat(this[i]))){flag = false; break;}
            }
            if(!flag) this.sort();
            else this.sort(function(a,b){return a-b});
        }    
        
        return this;
    }
}

//  example
//  >>> var x = [10,1,1,1,8,8,8,9,10,8,1,2,3,67];
//  >>> x.removeDuplicated();
//  >>> [9, 10, 8, 1, 2, 3, 67]

//  >>> x.removeDuplicated(true);  sort = true
// [1, 2, 3, 8, 9, 10, 67]

//  >>> var x = [10,1,1,1,8,8,8,9,10,8,1,2,3,67, 'test'];
//  >>> x.removeDuplicated();
//  [1, 10, 2, 3, 67, 8, 9, "test"]