forkable-iterator

Make a JS Iterator forkable.

Be aware that if you have a fork that is not consuming values as it gets further and further behind more memory will be used. Make sure you null out references to forks that you no longer need to allow garbage collection to occur.

Installation

npm install --save forkable-iterator

Also available on JSDelivr at "https://cdn.jsdelivr.net/npm/forkable-iterator@1".

Usage

import { buildForkableIterator, fork } from 'forkable-iterator';

function* Source() {
  yield 1;
  yield 2;
  return 'return';
}

const forkableIterator = buildForkableIterator(source());

console.log(forkableIterator.next()); // { value: 1, done: false }

const child1 = fork(forkableIterator);
// { value: 2, done: false }
console.log(child1.next());
// { value: 2, done: false }
console.log(forkableIterator.next());

// { value: 'return', done: true }
console.log(child1.next());
// { value: 'return', done: true }
console.log(forkableIterator.next());

API

buildForkableIterator(source)

Returns a ForkableIterator from the provided source iterator, which has the same API as Iterator, but can be forked.

To create a fork use the exported fork(forkableIterator) function.

The source iterator must not be read from directly as any forks will miss the values.

The returned ForkableIterator will not implement return() or throw() functions.

fork(forkableIterator)

Create a fork of the provided ForkableIterator at the current point.