Created
January 19, 2023 03:50
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Promise with Javascript
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| const work = async (id) => new Promise((resolve, reject) => { | |
| setTimeout(() => { | |
| console.log(`${(new Date()).toISOString()}: ${id}`) | |
| resolve() | |
| }, 1000) | |
| }); | |
| async function test1() { | |
| // parallel | |
| work('1.1') | |
| work('1.2') | |
| work('1.3') | |
| work('1.4') | |
| } | |
| async function test2() { | |
| // sequential | |
| await work('2.1') | |
| await work('2.2') | |
| await work('2.3') | |
| await work('2.4') | |
| } | |
| async function test3() { | |
| // sequential | |
| for (let i of ['3.1', '3.2', '3.3', '3.4']) { | |
| await work(i) | |
| } | |
| } | |
| async function test4() { | |
| // parallel | |
| ['4.1', '4.2', '4.3', '4.4'].forEach(async (i) => await work(i)) | |
| } | |
| async function test5() { | |
| // parallel | |
| let promises = ['5.1', '5.2', '5.3', '5.4'].map((i) => work(i)) | |
| await Promise.all(promises) | |
| } | |
| async function test5() { | |
| // parallel | |
| let promises = ['5.1', '5.2', '5.3', '5.4'].map((i) => work(i)) | |
| await Promise. all(promises) | |
| } | |
| (async () => { | |
| await test1() | |
| await test2() | |
| await test3() | |
| await test4() | |
| await test5() | |
| })() |
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