is-funcs/is-lt.js

A very limited subset of is-* functions I use every day

/**
 * Check if `data` is a lower than `than`
 * @param {number} data
 * @param {number} than
 * @return {boolean}
 */
module.exports = function(data, than) {
  return typeof data === 'number' && typeof than === 'number' && data < than
}