isAlphaNumeric.js

/**
 * Check that a Strings is alphanumeric (0-9 | a-z | A-Z)
 * 
 * Faster than regex
 * - src: https://stackoverflow.com/a/25352300
 * 
 * @param str
 * @returns {boolean} true if alphanum., false if not alphanum. or length is 0
 */
export function isAlphaNumeric(str) {
	if (str.length === 0) {
		return false;
	}

	var code, i, len;
  
	for (i = 0, len = str.length; i < len; i++) {
	  code = str.charCodeAt(i);
	  if (!(code > 47 && code < 58) && // numeric (0-9)
		  !(code > 64 && code < 91) && // upper alpha (A-Z)
		  !(code > 96 && code < 123)) { // lower alpha (a-z)
		return false;
	  }
	}
	return true;
};