Fastest way to duplicate an array in JavaScript - slice vs. 'for' loop

Question

In order to duplicate an array in JavaScript: which of the following is faster to use?

###Slice method

var dup_array = original_array.slice();
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Answer 1

Remember .slice() won't work for two-dimensional arrays. You'll need a function like this:

function copy(array) {
  return array.map(function(arr) {
    return arr.slice();
  });
}