I just update the docs to remove the also in you can also use splice. Hopefully, this makes it clearer that we recommend splice as an alternative to directly setting the length of an array.

As an aside, I don't actually recommend setting length to increase the size of an array in JavaScript. What you get at the end is not actually an array with 8 indices pointing to the value undefined, as it would appear, but rather 8 indices with undefined pointers. The difference is subtle, but has important implications. For example, if you try to map over this array with a.map(() => 3), what you'll get is [3, 3, undefined x 8], rather than [3, 3, 3, 3, 3, 3, 3, 3, 3, 3] as you might expect.