Alternative implementation of timed delay decorators

delay.js

function delay (invoke, ms) {
  return (...args) => new Promise(resolve => {
    setTimeout(resolve, ms)
  }).then(() => invoke.apply(...args))
}

function delay2 (invoke, ms) {
  return (...args) => new Promise(resolve => {
    setTimeout(resolve, ms, invoke(...args))
  })
}

/* Usage
Promise.waterfall(array, delay(invoke, 1000))
Promise.waterfall(array, delay2(invoke, 1000))
*/