copying arrays? (js)

Question

so lets say we have an array named 'arr'.
var arr = ["test"]
now when i make another copy of it, it simply "links" the array:
var arr2 = arr
arr2.push("test2")
console.log(arr) //["test", "test2"]
how can i make an actual copy of an array instead of linking them like this?

Answer 1

There are some ways to copy an array.

*Use slice
var arr1 = [0, 1, 2, 3, 4];
var arr2 = arr1.slice(0, arr1.length);
(Instead, you can use arr1.slice())

*Use concat
var arr1 = [0, 1, 2, 3, 4];
var arr2 = arr1.concat();

Answer 2

var arr2 = arr.slice(0);