https://github.com/nashaofu/parallel-to-serial

Parallel task based on Promise converted to serial task
https://github.com/nashaofu/parallel-to-serial

conversion parallel promise serial

Last synced: 7 days ago
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Parallel task based on Promise converted to serial task

• Host: GitHub
• URL: https://github.com/nashaofu/parallel-to-serial
• Owner: nashaofu
• License: mit
• Created: 2018-08-16T14:13:46.000Z (about 6 years ago)
• Default Branch: master
• Last Pushed: 2019-07-09T01:50:57.000Z (over 5 years ago)
• Last Synced: 2024-10-11T04:12:04.874Z (about 1 month ago)
• Topics: conversion, parallel, promise, serial
• Language: TypeScript
• Homepage:
• Size: 9.77 KB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# parallel-to-serial

Parallel task based on Promise converted to serial task

## examples

```js

const parallelToSerial = require('parallel-to-serial')

function square(val) {

  return new Promise((resolve, reject) => {

    setTimeout(() => {

      const result = Math.pow(val, 2)

      console.log(`${val} -> ${result}`)

      resolve(result)

    }, 1000)

  })

}

let timer

const data = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

const task = data.map(val => () => {

  clearTimeout(timer)

  // 并发多条时不打印-----

  // 保证为下一次调用切片时，在切片中间打印-----

  timer = setTimeout(() => console.log('--------'))

  return square(val)

})

console.log('并发量为1')

parallelToSerial(task, 1)

  .then(val => {

    console.log('整个任务执行完成：', data, '->', val)

  })

  .then(() => {

    console.log('\n并发量为3')

    return parallelToSerial(task, 3)

  })

  .then(val => {

    console.log('整个任务执行完成：', data, '->', val)

  })

```

Output results：

```

并发量为1

--------

1 -> 1

--------

2 -> 4

--------

3 -> 9

--------

4 -> 16

--------

5 -> 25

--------

6 -> 36

--------

7 -> 49

--------

8 -> 64

--------

9 -> 81

--------

10 -> 100

整个任务执行完成： [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ] -> [ 1, 4, 9, 16, 25, 36, 49, 64, 81, 100 ]

并发量为3

--------

1 -> 1

2 -> 4

3 -> 9

--------

4 -> 16

5 -> 25

6 -> 36

--------

7 -> 49

8 -> 64

9 -> 81

--------

10 -> 100

整个任务执行完成： [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ] -> [ 1, 4, 9, 16, 25, 36, 49, 64, 81, 100 ]

```