Clone Multidimensional Array in javascript

Question

I want to make a clone of multidimensional Array so that i can play arround with the clone array without affecting main Array.

I\'m using following function to do so

Answer 1

vsync is correct, my first answer doesn't handle var a = [[1,2],[3,4]];
So here's an improved version

var a = [[1,2],[3,4]];
Array.prototype.clone = function() {
    var arr = this.slice(0);
    for( var i = 0; i < this.length; i++ ) {
        if( this[i].clone ) {
            //recursion
            arr[i] = this[i].clone();
        }
    }
    return arr;
}

var b = a.clone()

console.log(a);
console.log(b);

b[1][0] = 'a';

console.log(a);
console.log(b);

//[[1, 2], [3, 4]]
//[[1, 2], [3, 4]]
//[[1, 2], [3, 4]]
//[[1, 2], ["a", 4]]