Function isCorrectFormat

Ciphers/AffineCipher.js:39–53

* Argument validation * @param {String} str - String to be checked * @param {Number} a - A coefficient to be checked * @param {Number} b - B coefficient to be checked * @return {Boolean} Result of the checking

(str, a, b)

 * @return {Boolean} Result of the checking
 */
function isCorrectFormat(str, a, b) {
  if (typeof a !== 'number' || typeof b !== 'number') {
    throw new TypeError('Coefficient a, b should be number')
  }

  if (typeof str !== 'string') {
    throw new TypeError('Argument str should be String')
  }

  if (!CoPrimeCheck(a, 26)) {
    throw new Error(a + ' is not coprime of 26')
  }

  return true
}

/**
 * Find character index based on ASCII order