functional-javascript-workshop/exercises/blocking_event_loop/solution/solution.js

The basics of functional programming in JavaScript. No libraries required.

function repeat(operation, num) {
  if (num <= 0) return

  operation()

  // release control every 10 or so
  // iterations.
  // 10 is arbitrary.
  if (num % 10 === 0) {
    setTimeout(function() {
      repeat(operation, --num)
    })
  } else {
    repeat(operation, --num)
  }
}

module.exports = repeat