iframe-proxy | Sunbelt Computer Software

72 lines (65 loc) · 1.5 KB

'use strict';
const metasync = require('metasync');
const async = (op) => {
  switch (op) {
    case 'map':
      return metasync.map;
    case 'filter':
      return metasync.filter;
    case 'reduce':
      return metasync.reduce;
    case 'each':
      return metasync.each;
    case 'series':
      return metasync.series;
    case 'find':
      return metasync.find;
    default:
      return null;
function ArrayChain(array) {
  this.array = array;
  this.chain = [];
ArrayChain.prototype.execute = function (err) {
  const item = this.chain.shift() || {};
  if (err) {
    if (!item.op) throw err;
    if (item.op === 'catch') {
      item.fn(err);
      return void this.execute();
    } else {
      return void this.execute(err);
  if (!item.op) return;
  if (item.op === 'then') {
    item.fn(this.array);
    return void this.execute();
  const op = async(item.op);
  if (!op) return void this.execute();
  op(this.array, item.fn, (err, data) => {
    if (err) return void this.execute(err);
    this.array = data;
    this.execute();
['then', 'catch', 'map', 'filter', 'reduce', 'each', 'series', 'find'].map(
  (op) => {
    ArrayChain.prototype[op] = function (fn) {
      this.chain.push({ op, fn });
      return this;
ArrayChain.prototype.fetch = function (fn) {
  this.chain.push({ op: 'then', fn: (res) => fn(null, res) });
  this.chain.push({ op: 'catch', fn });
  this.execute();
  return this;
module.exports = {
  for: (array) => new ArrayChain(array),

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