How to replace Buffer in javascript?

Question

JavaScript

I want to rewrite this pastebin.com/YGLK7KJd code so that it runs in the browser.
The first problem is what to replace Buffer with?

Answer 1

https://www.npmjs.com/package/buffer
https://github.com/substack/node-browserify

Answer 2

Normal string. Or an array. As a last resort, the function