That's a call out in the article, too. There's a Stage 2 proposal before TC-39 to add a bunch of useful library functions out of the box to the language. In the

That's a call out in the article, too. There's a Stage 2 proposal before TC-39 to add a bunch of useful library functions out of the box to the language. In the mean time there's an itertools.js "port" and also IxJS which mirrors RxJS (and .NET LINQ). (I've used IxJS to good effect in JS apps.)