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| import { ReadableStream, WritableStream } from 'stream/web'; | |
| async function measure(name, func) { | |
| for (let i = 0; i < 5; i++) { | |
| const start = Date.now(); | |
| await func(); | |
| console.log(`${name}: ${Date.now() - start}ms`); | |
| } | |
| } | |
| const count = 100000; | |
| await measure('stream', async () => { | |
| let i = 0; | |
| let sum = 0; | |
| await new ReadableStream({ | |
| pull(controller) { | |
| if (i < count) { | |
| controller.enqueue(i); | |
| i++; | |
| } else { | |
| controller.close(); | |
| } | |
| } | |
| }, { highWaterMark: 1 }).pipeTo(new WritableStream({ | |
| write(chunk) { | |
| sum += chunk; | |
| }, | |
| }, { highWaterMark: 10000 })) | |
| console.log(sum); | |
| }); | |
| await measure('call', () => { | |
| let sum = 0; | |
| function write(chunk) { | |
| sum += chunk; | |
| } | |
| for (let i = 0; i < count; i++) { | |
| write(i); | |
| } | |
| console.log(sum); | |
| }); |
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| const script = document.createElement('script'); | |
| script.src = 'https://unpkg.com/web-streams-polyfill/dist/polyfill.min.js'; | |
| script.onload = async () => { | |
| console.log(ReadableStream); | |
| async function measure(name, func) { | |
| const start = Date.now(); | |
| await func(); | |
| console.log(`${name}: ${Date.now() - start}ms`); | |
| } | |
| const count = 100000; | |
| await measure('stream', async () => { | |
| let sum = 0; | |
| await new ReadableStream({ | |
| start(controller) { | |
| for (let i = 0; i < count; i++) { | |
| controller.enqueue(i); | |
| } | |
| controller.close(); | |
| } | |
| }).pipeTo(new WritableStream({ | |
| write(chunk) { | |
| sum += chunk; | |
| }, | |
| })) | |
| console.log(sum); | |
| }); | |
| await measure('call', () => { | |
| let sum = 0; | |
| function write(chunk) { | |
| sum += chunk; | |
| } | |
| for (let i = 0; i < count; i++) { | |
| write(i); | |
| } | |
| console.log(sum); | |
| }); | |
| } | |
| document.head.appendChild(script); |
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