How to create copy of array? [duplicate]

Question

I have array:

var array = ["a", "b", "c"];

I need save this array to another variable

var save = array;

Now I need splice from save first index but when I try it, the index is removed from both arrays.

var array = ["a", "b", "c"];
var save = array;

save.splice(0, 1);
console.log(array);
console.log(save);

Read up on value type vs reference type for the reason why this happens. — Seth Flowers
– Seth Flowers, Commented Sep 6, 2016 at 18:12

Pranav C Balan · Accepted Answer · 2016-09-06 18:13:07Z

8

You need to copy the array using Array#slice otherwise save holds the reference to the original array(Both variables are pointing to the same array).

var save = array.slice();

var array = ["a", "b", "c"];
var save = array.slice();

save.splice(0, 1);
console.log(array);
console.log(save);

edited Sep 6, 2016 at 18:13

answered Sep 6, 2016 at 18:10

Pranav C Balan

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1 Comment

Pranav C Balan Over a year ago

@Dave : glad to help

Divyanth Jayaraj · Accepted Answer · 2016-09-06 18:11:53Z

1

If it's a flat array with no circular references, you can use

var copied_array = JSON.parse(JSON.stringify(original_array));

This works for flat objects as well.

answered Sep 6, 2016 at 18:11

Divyanth Jayaraj

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