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Copy and sort array

importance: 5

We have an array of strings arr. We’d like to have a sorted copy of it, but keep arr unmodified.

Create a function copySorted(arr) that returns such a copy.

let arr = ["HTML", "JavaScript", "CSS"];

let sorted = copySorted(arr);

alert( sorted ); // CSS, HTML, JavaScript
alert( arr ); // HTML, JavaScript, CSS (no changes)

We can use slice() to make a copy and run the sort on it:

function copySorted(arr) {
  return arr.slice().sort();
}

let arr = ["HTML", "JavaScript", "CSS"];

let sorted = copySorted(arr);

alert( sorted );
alert( arr );

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