Reduce an array and return a Promise.
$ npm install promise-reduce
const reduce = require('promise-reduce')
Promise.resolve([1, 2, 3])
.then(reduce((prev, next) => prev + next), 0))
// => 6
This module is basically equivalent to bluebird.reduce, but it's handy
to have the one function you need instead of a kitchen sink. Modularity!
Especially handy if you're serving to the browser and need to reduce your
javascript bundle size.
Works great in the browser with browserify!