var asciiWords = require('./_asciiWords'),
      hasUnicodeWord = require('./_hasUnicodeWord'),
      toString = require('./toString'),
      unicodeWords = require('./_unicodeWords');
  
  /**
   * Splits `string` into an array of its words.
   *
   * @static
   * @memberOf _
   * @since 3.0.0
   * @category String
   * @param {string} [string=''] The string to inspect.
   * @param {RegExp|string} [pattern] The pattern to match words.
   * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
   * @returns {Array} Returns the words of `string`.
   * @example
   *
   * _.words('fred, barney, & pebbles');
   * // => ['fred', 'barney', 'pebbles']
   *
   * _.words('fred, barney, & pebbles', /[^, ]+/g);
   * // => ['fred', 'barney', '&', 'pebbles']
   */
  function words(string, pattern, guard) {
    string = toString(string);
    pattern = guard ? undefined : pattern;
  
    if (pattern === undefined) {
      return hasUnicodeWord(string) ? unicodeWords(string) : asciiWords(string);
    }
    return string.match(pattern) || [];
  }
  
  module.exports = words;