Functional loop

recursion.js

const loop = (() => {
  const recur = (callback, count, i=0) => {
    if (i == count-1) return callback(i);
    callback(i);
    return recur(callback, count, i+1);
  };
  return (callback, count) => {
    if (count > 0) return recur(callback, count);
  };
})();