Office Whisperer

/** * @author Toru Nagashima <https://github.com/mysticatea> */ "use strict"; /** * Check whether given two characters are a surrogate pair. * @param {number} lead The code of the lead character. * @param {number} tail The code of the tail character. * @returns {boolean} `true` if the character pair is a surrogate pair. */ module.exports = function isSurrogatePair(lead, tail) { return lead >= 0xD800 && lead < 0xDC00 && tail >= 0xDC00 && tail < 0xE000; };