-
-
Save laphilosophia/210349398004fe55a68daf8568fa5a44 to your computer and use it in GitHub Desktop.
Execute promises sequentially (one at at a time) and return array with the results
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
function promiseMap(inputValues, mapper) { | |
const reducer = (acc$, inputValue) => | |
acc$.then(acc => mapper(inputValue).then(result => acc.push(result) && acc)); | |
return inputValues.reduce(reducer, Promise.resolve([])); | |
} | |
/* Example */ | |
const axios = require('axios'); | |
function countryFromIp(ip) { | |
return axios.get(`http://ip-api.com/json/${ip}`) | |
.then(res => res.data.country); | |
} | |
promiseMap(["8.8.8.8", "41.182.194.0", "5.34.159.1"], countryFromIp).then(console.log); |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment