How can I mutate arrays in JavaScript?

How can I mutate arrays in JavaScript?

You can mutate arrays in JavaScript using methods like push, pop, shift, unshift, splice, and more. What specific operation are you interested in?

Can you explain how the splice method works?

Sure! The splice method changes the contents of an array by removing or replacing existing elements and/or adding new elements. It takes three arguments: the index to start at, the number of elements to remove, and the elements to add.

Can you give me an example of using splice?

Absolutely! If you have an array like let arr = [1, 2, 3, 4]; and you call arr.splice(1, 2, 5, 6);, it will remove 2 elements starting from index 1 and add 5 and 6. The new array will be [1, 5, 6, 4].

What about the pop method? How does it work?

The pop method removes the last element from an array and returns that element. It changes the length of the array. For example, if you have let arr = [1, 2, 3]; and call arr.pop();, the array becomes [1, 2].