Javascript Array clone()

/**/*w ww. j av  a2  s.  co m*/
 * Makes a shallow copy of the array.
 *
 * @method Array.prototype.clone
 * @return {Array} A shallow copy of the array
 */
Array.prototype.clone = function() {
    return this.slice(0);
};

Array.prototype.clone = function () {
  var newArray = new Array();
  for(var index=0; index<this.length;index=index+1) {
    newArray[index] = this[index];// www. jav a  2s. com
  }
  return newArray;
};

Array.prototype.clone = function () {

  var input = this;

  var output = [];

  for ( var i = 0; i < input.length; ++i ) {

    output[i] = input[i];//from ww  w .j  av a 2s  . c o m

  };

  return output;

};

// function for duplicating arrays
Array.prototype.clone = function() {
    var arr = this.slice(0);
    for( var i = 0; i < this.length; i++ ) {
        if( this[i].clone ) {
            arr[i] = this[i].clone();/*from   w  ww . j a  v a  2s .c  o m*/
        }
    }
    return arr;
}

Array.prototype.clone = function() {
 var results = new Array(this.length);
 for (var i = 0, len = this.length; i < len; i++) {
  results[i] = this[i];/*from   w w  w  .j a  va  2 s . c  o  m*/
 }
 
 return results;
};

// refactored/*from  ww w.  j  a v a 2 s.  c om*/
Array.prototype.clone = function() {
 return [].concat(this);
};

Array.prototype.clone = function() 
{
    var arr = this.slice(0);
    for( var i = 0; i < this.length; i++ ) 
    {// w w w .j  ava2 s  . com
        if(this[i].clone) 
        {            
            arr[i] = this[i].clone();
        }
    }
    return arr;
}

/*/*from w w  w  . j  a v a 2s.c o m*/
 Array are pass by reference so by mistake a reference value is changed, value will be changed in source as well.

 Cloning an array: copy the source of an array as new array
*/ 

// Example
var arr = [1, 2, 3, 4];

Array.prototype.clone = function() {
 return this.slice(0);
};

var arr2 = arr.clone();
arr2.push(5);

console.log(arr2); // [1, 2, 3, 4, 5] - changed
console.log(arr1); // [1, 2, 3, 4] - same

Array.prototype.clone = function() {
    var isArr = function(elm){
        return String(elm.constructor).match(/array/i) ? true : false;
    }// www. j  a v  a 2s. c o m
    var cloner = function(arr){
        var arr2 = arr.slice(0), len = arr2.length;
        for(var i=0; i < len; i++){
            if( isArr(arr2[i]) )
               arr2[i]=cloner( arr2[i] );
        }
        return arr2;
    }
    return cloner(this);
}