How to copy or duplicate an array of arrays

Question

I am trying to create a function that duplicates an array of arrays. I tried blah.slice (0); but it only copies links. I need to make a duplicate that will leave the original intact.

I found this prototype method http://my.opera.com/GreyWyvern/blog/show.dml/1725165

Object.prototype.clone = function() {
  var newObj = (this instanceof Array) ? [] : {};
  for (i in this) {
    if (i == 'clone') continue;
    if (this[i] && typeof this[i] == "object") {
      newObj[i] = this[i].clone();
    } else newObj[i] = this[i]
  } return newObj;
};

This works, but it confuses the jQuery plugin that I use, so I need to turn it into a function ... and recursion is not the strongest.

Your help will be appreciated!

Greetings

Answer 1

function clone (existingArray) {
   var newObj = (existingArray instanceof Array) ? [] : {};
   for (i in existingArray) {
      if (i == 'clone') continue;
      if (existingArray[i] && typeof existingArray[i] == "object") {
         newObj[i] = clone(existingArray[i]);
      } else {
         newObj[i] = existingArray[i]
      }
   }
   return newObj;
}

Answer 2

For instance:

clone = function(obj) {
    if (!obj || typeof obj != "object")
        return obj;
    var isAry = Object.prototype.toString.call(obj).toLowerCase() == '[object array]';
    var o = isAry ? [] : {};
    for (var p in obj)
        o[p] = clone(obj[p]);
    return o;
}

improved according to comments