Function next

chapter05/5.4 - Next Number/nextNumber.js:8–14

(number, numOnes, iterator)

};

var next = function(number, numOnes, iterator) {
  var currNum = iterator(number);
  while (countOnes(currNum.toString(2)) !== numOnes) {
    currNum = iterator(currNum);
  }
  return currNum;
};

var nextSmallest = function(number, numOnes) {
  return next(number, numOnes, currNum => currNum - 1);