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Create a new array without affecting the values ​​from the old array

I am trying to create a copy of an existing array and remove some elements from the copy of the array without affecting the original. I've tried this:

var new_arr = old_arr; //when I remove from new array the items from old array are also removed

How do I create a completely new copy of an existing array?

Update:

When I do this:

var new_arr = old_arr.slice();

and then:

new_arr[0].shift();
new_arr[1].shift();

Items from old_array are removed. It is a two dimensional array.

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2 answers


You can use two methods, these are:

function clone (src) {
    return JSON.parse(JSON.stringify(src));
}


or that:

var newArray = oldArray.slice();
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Using Yoshi's answer, you can extend the Array prototype (just a helper):



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