iframe-proxy | Sunbelt Computer Software

51 lines (42 loc) · 1.02 KB

'use strict';
const metasync = require('metasync');
const arrayChain = (array, prev = null) => {
  let next = null,
    done = null,
    fail = null;
  const self = (err, data) => {
    array = data;
    if (next) next();
    if (err) {
      if (fail) fail(err);
    } else if (done) {
      done(data);
  if (!prev) process.nextTick(() => self(null, array));
  self.then = (fn) => {
    done = fn;
    return self;
  self.catch = (fn) => {
    fail = fn;
    return self;
  self.fetch = (fn) =>
    self.then((data) => fn(null, data)).catch((err) => fn(err));
  const chain = (performer) => (fn, initial) => {
    const res = arrayChain(null, self);
    next = () => performer(array, fn, res, initial);
    return res;
  self.map = chain(metasync.map);
  self.filter = chain(metasync.filter);
  self.reduce = chain(metasync.reduce);
  self.each = chain(metasync.each);
  self.series = chain(metasync.series);
  self.find = chain(metasync.find);
  return self;
module.exports = {
  for: arrayChain,

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