Generate a range in Javascript

recursive-version.js

function recursiveRange(a, b) {
  if (a + 1 === b) {
    return [];
  }
  return [a + 1].concat(range(a + 1, b));
}

regular-version.js

function range(a, b) {
  var result = [];
  for (var i = a + 1, i < b; i++) {
    result.push(i);
  }
  return result;
}