Things I Learned Writing a Fibonacci Generator in JavaScript

Re:Things I Learned Writing a Fibonacci Generator in JavaScript by symbiosis on Tuesday May 17, 2016 @06:46AM (#11712497)

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..

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Re:Things I Learned Writing a Fibonacci Generator in JavaScript by gravypod on Tuesday May 17, 2016 @03:35PM (#11716628)

While I do agree generators offer some amazing features, I think they also offer some complexity that we are currently not ready to handle.

from a given for loop:

  for (x in function())

Please tell me when this for loop will end. You cannot.

If you instead did...

  next = fib()
  while (true) {
    number = next();
  }

You are instantly presented for every case in which this loop will terminate.

Now don't get me wrong, I DO fully agree that a generator is the correct method for doing this, I'm just pointing out another construct to allow you to do this.

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