Removes duplicate primitives from an array.

gistfile1.js

Array.prototype.unique = function(){
    var map = {};
    
    for(var i = 0; i < this.length; i++)
        map[this[i]] = this[i];
    
    this.length = 0;
    
    for(var key in map)
        this.push(map[key]);
    
    return this;  // Return to enable chaining.
}
Array.prototype.shuffle = function(){
    var j, temp;
    
    for(i = this.length-1; i > 1; i--){
        j = Math.floor(Math.random() * (i + 1));
        
        temp = this[i];
        this[i]  = this[j];
        this[j]  = temp;
    }
    
    return this;  // Return to enable chaining.
}