Javascript passing arrays to functions by value, leaving original array unaltered

Question

I\'ve read many answers here relating to \'by value\' and \'by reference\' passing for sending arrays to javascript functions. I am however having a problem sending an array

Answer 1

A variable pointing to an array is a reference to it. When you pass an array, you're copying this reference.

You can make a shallow copy with slice(). If you want a full depth copy, then recurse in sub objects, keeping in mind the caveats when copying some objects.