How can you sort an array without mutating the original array?

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You need to copy the array before you sort it. One way with es6:

const sorted = [...arr].sort();

The spread-syntax as array literal (copied from mdn):

var arr = [1, 2, 3];
var arr2 = [...arr]; // like arr.slice()

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_operator

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