api-cheatsheet-array.md

This content moved here: https://exploringjs.com/impatient-js/ch_arrays.html#quickref-arrays

Good article!! Could I translate this into Japanese?
I'll write down the link to this article.

Nice summary! Yet another way of documenting using only examples https://github.com/marcinnajder/powerseq (tooltips)

I think you're missing smoosh 😆

This is awesome

Could be useful this interactive Array Explorer by @sdras

There's a typo in push methods description: "Adds adds <...>"

Here is a similar stuff.