Sequential Promise

Simply async task runnner as sequential

API Docs

https://hideokamoto.github.io/sequential-promise/

Before the package (Async style)

We have to run the task as asynchronous

1import * as moment from 'moment'
2
3const dummy = async () => {
4  return new Promise(resolve => setTimeout(resolve, 1000))
5}
6
7const asyncFunc = async () => {
8
9  const arr = [1,2,3,4,5]
10  const result = await Promise.all(arr.map(async i => {
11    const start = moment()
12    console.log(`Number: ${i}`)
13    console.log(`Start: ${start.toISOString()}`)
14    await dummy()
15    console.log(`End ${moment().toISOString()}`)
16    console.log(`${moment().diff(start, 'seconds')} sec`)
17    console.log(' ')
18    return i + 1
19  }))
20  return result
21})
22
23asyncFunc().then(result => console.log(result))

The function will run async.

1Number: 1
2Start: 2019-08-30T07:52:43.862Z
3Number: 2
4Start: 2019-08-30T07:52:43.862Z
5Number: 3
6Start: 2019-08-30T07:52:43.863Z
7Number: 4
8Start: 2019-08-30T07:52:43.863Z
9Number: 5
10Start: 2019-08-30T07:52:43.863Z
11End 2019-08-30T07:52:44.866Z
121 sec
13 
14End 2019-08-30T07:52:44.866Z
151 sec
16 
17End 2019-08-30T07:52:44.867Z
181 sec
19 
20End 2019-08-30T07:52:44.867Z
211 sec
22 
23End 2019-08-30T07:52:44.867Z
241 sec
25 
26[ 2, 3, 4, 5, 6 ]

Use the package

To use the package, we can run sequential

Typescript

1import * as moment from 'moment'
2import sequentialPromise from '@hideokamoto/sequential-promise'
3
4sequentialPromise<number, string>([1,2,3,4,5], async (i) => {
5  const start = moment()
6  console.log(`Number: ${i}`)
7  console.log(`Start: ${start.toISOString()}`)
8  await dummy()
9  console.log(`End ${moment().toISOString()}`)
10  console.log(`${moment().diff(start, 'seconds')} sec`)
11  console.log(' ')
12  return `${i} + 2 = ${i + 2}`
13}).then(r => console.log(r))

JavaScript

1const moment = require('moment')
2const sequentialPromise = require('@hideokamoto/sequential-promise')
3
4sequentialPromise([1,2,3,4,5], async (i) => {
5  const start = moment()
6  console.log(`Number: ${i}`)
7  console.log(`Start: ${start.toISOString()}`)
8  await dummy()
9  console.log(`End ${moment().toISOString()}`)
10  console.log(`${moment().diff(start, 'seconds')} sec`)
11  console.log(' ')
12  return `${i} + 2 = ${i + 2}`
13}).then(r => console.log(r))

Result

This is the result.

1 Number: 1
2 Start: 2019-08-30T07:35:00.175Z
3 End 2019-08-30T07:35:01.182Z
4 1 sec
5
6 Number: 2
7 Start: 2019-08-30T07:35:01.184Z
8 End 2019-08-30T07:35:02.188Z
9 1 sec
10
11 Number: 3
12 Start: 2019-08-30T07:35:02.188Z
13 End 2019-08-30T07:35:03.194Z
14 1 sec
15
16 Number: 4
17 Start: 2019-08-30T07:35:03.194Z
18 End 2019-08-30T07:35:04.200Z
19 1 sec
20
21 Number: 5
22 Start: 2019-08-30T07:35:04.200Z
23 End 2019-08-30T07:35:05.206Z
24 1 sec
25
26 [ '1 + 2 = 3', '2 + 2 = 4', '3 + 2 = 5', '4 + 2 = 6', '5 + 2 = 7' ]

contribution

1// clone
2$ git clone git@github.com:hideokamoto/sequential-promise.git
3$ cd sequential-promise
4
5// setup
6$ yarn
7
8// Unit test
9$ yarn test
10or
11$ yarn run test:watch
12
13// Lint
14$ yarn run lint
15or
16$ yarn run lint --fix
17
18// Build
19$ yarn run build
20
21// Rebuild docs
22$ yarn run doc