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With ES6+ you can simply do this

const original = [1, 2, 3];
const newArray = [...original];

With ES6+ you can simply do this

const original = [1, 2, 3];
const newArray = [...original];

The documentation for spread syntax is here

To check, run this small code on dev console

const k = [1, 2];
const l = k
k === l
> true
const m = [...k]
m
> [1, 2]
k === m
> false