How can I mutate an array in JavaScript?

How can I mutate an array in JavaScript?

You can mutate an array in JavaScript using methods like push, pop, shift, unshift, splice, and more.

Can you give me an example of using splice?

Sure! You can use splice to add or remove elements. For example, array.splice(1, 1, 'newItem') removes one item at index 1 and adds 'newItem'.

What happens if I use splice with a negative index?

Using a negative index with splice counts from the end of the array. For example, array.splice(-1, 1) removes the last item.

Are there any methods that don't mutate the original array?

Yes! Methods like map, filter, and slice return new arrays without mutating the original.