promisu/src/lib/PromisuFilter/index.js

functional promise with map filter reduce scan all race every some few try waitfor finally queue debounce throttle

const PromisuMap = require('../PromisuMap')

const PromisuFilter = (iterable, filterFn, opts) =>
  PromisuMap(iterable, (el, i) => Promise.all([filterFn(el, i), el]), opts)
    .then(values => values.filter(x => Boolean(x[0])).map(x => x[1]))

module.exports = PromisuFilter