aonghusonia

  const varg = (fn, arity) => (...args) => {
    const l = args.length < arity ? args.length : arity;
    return typeof args[l - 1] === 'function'
      ? fn(
          ...args.slice(0, -1),
          ...new Array(arity - l).fill(undefined),
          args[l - 1]
        )
      : fn(...args, ...new Array(arity - args.length).fill(undefined));
  };

aonghusonia

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) =>