promise-compose

Compose an arbitrary number of functions that accept one argument and return either a value or a Promise.

$ npm install promise-compose

Usage

import assert from 'assert'
import compose from 'promise-compose'

const double = x => x * 2
const square = x => x * x
const root = x => Promise.resolve(Math.sqrt(x))

// From left to right.
compose(root, double, square)(9)
.then(result => assert.equal(result, 36))

// From right to left.
compose.right(square, double, root)(9)
.then(result => assert.equal(result, 36))

This library assumes that Promise is a global that implements the ES6 Promise specification. If you're not sure if the environment has Promise or you want to use something else, simply override compose.Promise.

License

This software is licensed under the MIT license.