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

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

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

function trampoline(fn) {
  while(fn && typeof fn === 'function') {
    fn = fn()
  }
}

module.exports = function(operation, num) {
  trampoline(function() {
    return repeat(operation, num)
  })
}