helper functions

helpers.js

const wait = ms => x => new Promise(resolve => setTimeout(resolve, ms, x));

const pipeP = (...fns) => x =>
  fns.reduce((p, fn) => p.then(fn), Promise.resolve(x));

const pipe = (...fns) => x => fns.reduce((acc, fn) => fn(acc), x);

const pipeC = (...fns) => (...args) =>
  fns.reduceRight(
    (acc, fn) =>
      (err, ...xs) => err
        ? args[args.length - 1](err)
        : fn(...xs, acc),
    args[args.length - 1]
  )(null, ...args.slice(0, -1));

const trampoline = func => arg => {
  let value = func(arg);
  while (typeof value === "function") {
    value = value();
  }
  return value;
};