text: /**
   * Given two strings, find the number of common characters between them.
   *
   * @param {String} s1
   * @param {String} s2
   * @return {Number}
   *
   * @example
   * For s1 = "aabcc" and s2 = "adcaa", the output should be 3
   * Strings have 3 common characters - 2 "a"s and 1 "c".
   */
  function getCommonCharacterCount(s1, s2) {
    const s = s2.split('');
  
    function f(a) {
      const ind = s.findIndex((i) => i === a);
      if (ind >= 0) {
        s[ind] = '-';
        return true;
      }
      return false;
    }
    return s1.split('').reduce((pv, i) => (f(i) ? pv + 1 : pv), 0);
  }
  
  module.exports = getCommonCharacterCount;
  