text: "use strict";
  
  /**
   * TODO: Write a function that counts all alphanumeric characters in a string.
   * Alphanumeric characters are A-Z, a-z and 0-9
   * @param str: string
   */
  
  function countAlphaNumeric(str) {
    if (typeof str !== "string") {
      throw new TypeError("Invalid Type");
    }
  
    let result = 0;
  
    for (let i = 0; i < str.length; i++) {
      (str[i].match(/[a-zA-Z0-9]/)) ? result += 1 : null;
    }
    return result;
  }
  
  module.exports = countAlphaNumeric;