symbiosis

Ugmonk

This is just custom iterator/generator. Saw many like this before Babel.

The point is that ES2015 defines clear interface for iterating over iterables. With help of Symbol and *.

If you would use this code in production, probably you would document it: ... returns iterator function.

  next = fib()
  next() // 0
  next() // 1
  next() // 1 ...

But if you would use Symbol.iterator

then you can do

  for (f of fib()) 
    console.log(f)

or use gathering, spreading etc..

React is eating the world. Reactify all the things!

So how did Bellatrix Lestrange escape from the Azkaban?