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 );