fakenickels · May 28, 2018 13:57
diff --git a/usage.js b/usage.js
 const mail = (foo, t) => new Promise((resolve) => setTimeout(() => { console.log(foo); resolve() }, t))


 async function doThing() {
 const  items = ['foo', 'bar', 'buz', 'fuz'];

  await waterfall(items.map((item) => async () => { await mail('mailing' + item, 4000); }))

  await mail("end", 1000)
 }
diff --git a/waterfall.js b/waterfall.js
 const waterfall = (promises) => promises.reduce((wfall, currentPromise) => wfall.then(currentPromise), Promise.resolve())
	const mail = (foo, t) => new Promise((resolve) => setTimeout(() => { console.log(foo); resolve() }, t))


	async function doThing() {
	const items = ['foo', 'bar', 'buz', 'fuz'];

	await waterfall(items.map((item) => async () => { await mail('mailing' + item, 4000); }))

	await mail("end", 1000)
	}