Created
June 8, 2017 08:38
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JavaScript Async Await Sequential and Parallel Test
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| async function testSequential() { | |
| async function f1 (){ | |
| let promise = new Promise((resolve, reject) => { | |
| setTimeout(()=>{resolve(2)}, 2000); | |
| }); | |
| return promise; | |
| } | |
| async function f2 (){ | |
| let promise = new Promise((resolve, reject) => { | |
| setTimeout(()=>{resolve(2)}, 2000); | |
| }); | |
| return promise; | |
| } | |
| console.time("first await finished"); | |
| let r1 = await f1(); | |
| console.timeEnd("first await finished"); | |
| console.time("second await finished"); | |
| let r2 = await f2(); | |
| console.timeEnd("second await finished"); | |
| return r1 + r2; | |
| } | |
| async function testParallel() { | |
| async function f1 (){ | |
| let promise = new Promise((resolve, reject) => { | |
| setTimeout(()=>{resolve(2)}, 2000); | |
| }); | |
| return promise; | |
| } | |
| async function f2 (){ | |
| let promise = new Promise((resolve, reject) => { | |
| setTimeout(()=>{resolve(2)}, 2000); | |
| }); | |
| return promise; | |
| } | |
| console.time("await finished"); | |
| let r1 = await Promise.all([f1(),f2()]); | |
| console.timeEnd("await finished"); | |
| return r1[0] + r1[1]; | |
| } | |
| async function start(){ | |
| console.time("testParallel"); | |
| let result = await testParallel(); | |
| console.log(result); | |
| console.timeEnd("testParallel"); | |
| console.time("testSequential"); | |
| result = await testSequential(); | |
| console.log(result); | |
| console.timeEnd("testSequential"); | |
| } | |
| start(); |
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