There is an implementation of array copy, but array.slice is now available in all browsers since 2015.

It’s been available across browsers since July 2015.
https://developer.mozilla.org/fr/docs/Web/JavaScript/Reference/Global_Objects/Array/slice#compatibilit%C3%A9_des_navigateurs

Originally posted by @jdeniau in #2095 (comment)