From d8169280aa6fe1bc97c0c16f3ebc106aa355ad3c Mon Sep 17 00:00:00 2001 From: oleksii golikov Date: Mon, 9 Jul 2018 21:49:11 +0300 Subject: [PATCH] for await example --- JavaScript/a-for-await.js | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 JavaScript/a-for-await.js diff --git a/JavaScript/a-for-await.js b/JavaScript/a-for-await.js new file mode 100644 index 0000000..c445378 --- /dev/null +++ b/JavaScript/a-for-await.js @@ -0,0 +1,38 @@ +'use strict'; + +async function * slowCounter() { + let counter = 0; + while (true) { + counter += 1; + yield new Promise((resolve) => { + setTimeout(() => resolve(counter), 1000); + }) + } +} + +async function * fastCounterDown() { + let counter = 1000000; + while (true) { + counter -= 1; + yield counter; + } +} + +async function* zip (a, b) { + while (true) { + const [first, second] = await Promise.all([ + a.next(), + b.next(), + ]); + + yield [first.value, second.value]; + } +} + +async function main () { + for await (let it of zip(slowCounter(), fastCounterDown())) { + console.log(it); + } +} + +main(); pFad - Phonifier reborn

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