Sequencing Delayed Functions

queue.js

/**
 * Curried delay function
 */
const delay = (cb, delay = 0) => (...args) => setTimeout(() => {
  cb()
  if (args.length > 0) args.shift()(...args)
}, delay)

/**
 * Fire series of delays
 */
const queue = (...args) => args.shift()(...args)

/**
 * Create delayed functions
 */
const hello = delay(
  () => console.log('Hello')
, 500)

const beautiful = delay(
  () => console.log('beautiful')
, 500)

const world = delay(
  () => console.log('world!')
, 500)


/**
 * Run sequence
 */
queue(hello, beautiful, world)