getLastWord.js

/**
 * getLastWord - Splits the given string in
 * its last word and pass the result into the callback
 *
 * @param {String} str
 * @param {Function} callback - Takes as arguments the first part of the text (without the last word) and the last word.
 */
export function getLastWord(str, callback) {
  if (typeof str !== 'string') str = '';

  const LAST_WORD_REGEXP = /(.+)\s((?:.+)?\S$)/;
  const match = str.trim().match(LAST_WORD_REGEXP);

  if (!match) return callback('', str);

  const group1 = match[1] || '';
  const group2 = match[2] || '';

  return callback(group1, group2);
}