trampoline.js

let trampoline = (fn) => (...args) => {
  let next = fn(...args)
  while(next instanceof Function) 
    next = next()
  return next
}

let range = (start, end, result=[]) => {
  result.push(start)
  if(start === end) return result
  return () => range(start < end ? ++start : --start, end, result)
}

let result = trampoline(range)(5, 1)