Thenction NPM | npm.io

thenction

thenction is an abbreviation of thenable function.

Install

$ npm i -S thenction

Usage

const thenction = require('thenction')(Promise)
// or: const thenction = require('thenction')(require('your-favorite-promise-lib'))

const twiceLog = thenction(value => value * 2).then(value => (console.log(value), value))

Promise.resolve(2).then(twiceLog)
//=> 4

twiceLog(2).then(value => console.log(value))
//=> 4
//=> 4

Promise.resolve(2).then(twiceLog.then(twiceLog))
//=> 4
//=> 8

const twiceLogSleep = twiceLog
  .then(value => new Promise(resolve => setTimeout(resolve, 1000, value)))

Promise.resolve(2).then(twiceLogSleep).then(twiceLog)
//=> 4
// after 1s
//=> 8

const twiceLogError = twiceLog
  .then(value => { throw new Error('wow') })
  .catch(error => console.log(error))

Promise.resolve(2).then(twiceLogError)
//=> 4
//=> Error: wow