Fetch hackernews API using es6 generator functions and fetch API on Node@6

levelOrderHNFetchStoryWithComments.js

const fetch = require( 'node-fetch' ) // skip if in Chrome Latest version

const hnItemUrlBase = 'https://hacker-news.firebaseio.com/v0/item/' // HN Url Base
const hnItemId = 14561637 // real itemId 

// hacker news required format 
const makeItemUrl = ( prefix, itemId ) => `${prefix}${itemId}.json`

// fetch Wrapper
const fetchWrapper = ( prefix, itemId ) => {
	const itemUrl = makeItemUrl( prefix, itemId )
	return fetch( itemUrl )
    // get json from body
		.then( res => res.json())

		.then( jsonRes => {
      // pass the value to yield back in the generator function
			it.next( jsonRes ) 
		})
}

// do a levelOrder on Async Tree of Items. Story Item is at the root passed
function *levelOrder( prefix, itemId ) {
	const queue = []
  
  // wait until json is received
	let current = yield fetchWrapper( prefix, itemId )

	queue.push( current )

	while ( queue.length ) {
		current = queue.shift();
		console.log( current.id );

		if ( current.kids ) {
			for ( let kid of current.kids ) {
				current = yield fetchWrapper( prefix, kid )
				queue.push( current )
			}
		}

	}

}

// construct 
const it = levelOrder( hnItemUrlBase, hnItemId )
it.next(  ) // start