doc: update stream.reduce concurrency note
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| ```mjs | ||
| import { Readable } from 'node:stream'; | ||
| import { readdir, stat } from 'node:fs/promises'; | ||
| import { join } from 'node:path'; | ||
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| const ten = await Readable.from([1, 2, 3, 4]).reduce((previous, data) => { | ||
| return previous + data; | ||
| }); | ||
| console.log(ten); // 10 | ||
| const directoryPath = './src'; | ||
| const filesInDir = await readdir(directoryPath); | ||
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| const folderSize = await Readable.from(filesInDir) | ||
| .reduce(async (totalSize, file) => { | ||
| const { size } = await stat(join(directoryPath, file)); | ||
| return totalSize + size; | ||
| }, 0); | ||
|
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| console.log(folderSize); | ||
| ``` |
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Updated this example as well so the refactor can be more obvious
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PR-URL: #47166 Reviewed-By: Matteo Collina <[email protected]> Reviewed-By: Mohammed Keyvanzadeh <[email protected]>
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PR-URL: #47166 Reviewed-By: Matteo Collina <[email protected]> Reviewed-By: Mohammed Keyvanzadeh <[email protected]>
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At first, when I read that note I thought I should do this:
This did not work and does not make any sense as the map items are emitted in the order that got from the readable stream.
So I thought of changing to note to recommend implementing reduce using
.forEachwith concurrency but then I understand what @benjamingr meant when he wrote that note - because the only way you will need concurrency is if you do some async operation (because sync block the loop - bla bla) and that operation can be parallelized so I updated the note with an example@benjamingr, hope this is what you meant 😅