exercises.creditcard.js

/**
 * @fileoverview Utils Interface credit card validation methods.
 * @author (Wind Tammer)
 */
 utils = {};
 
 /** @type {Object<Function>} */
 utils.creditcard = {};
 

/**
 * Checks whether credit card number is valid.
 * @param {string} cardNumber Credit card number.
 * @return {Boolean}
 */
utils.creditcard.validateNumber = function(cardNumber) 
{
  // Function has to return boolean identifying whether credit
  // card number contains exactly 16 digits.
  
  return /^\d{16}$/.test(cardNumber);
  
};
		



/**
 * Checks whether credit card security code is valid.
 * @param {string} securityCode Credit card security.
 * @return {Boolean}
 */
utils.creditcard.validateSecurityCode = function(securityCode) {
  // Function has to return boolean identifying whether credit
  // card security code (CVV/CVC) contains exactly 3 digits.
  
  return /^\d{3}$/.test(securityCode);
		
};  


/**
 * Checks whether credit card name is valid.
 * @param {string} name Credit card owner name.
 * @return {Boolean}
 */
utils.creditcard.validateName = function(name) {
  // Function has to return boolean identifying whether name on
  // the credit card contains at least 2 words with no digits.

		return /^[a-z]{2,}(\s[a-z]{2,}){1,}$/i.test(name);
		
};  

/**
 * Checks whether credit card expiration date is valid.
 * @param {string} expirationDate Credit card expiration date in
 *    YYYY-MM format.
 * @return {Boolean}
 */
 utils.creditcard.validateDate = function(expirationDate) {
  // Function has to return boolean identifying whether credit
  // card expiration date is at least next month. If today is April,
  // expiration date has to be at least May.
  var expirationDateArray = expirationDate.split('-', 2);
  var today = new Date();
  var thisMonth = today.getUTCMonth() + 1;
  var thisYear = today.getFullYear();
  var givenMonth = parseInt(expirationDateArray[1], 10);
  var givenYear = parseInt(expirationDateArray[0], 10);
  
return(givenYear > thisYear) || (givenYear == thisYear) && (givenMonth > thisMonth);
};

exercises.creditcard.tests.js

/**
 * @fileoverview Super simple Unit tests. If any outputs
 * 'false' function is not working as planned.
 * @author (Wind Tammer)
 */

console.log(utils.creditcard.validateNumber('4111111111111111') === true);
console.log(utils.creditcard.validateNumber('2312312312') === false);
console.log(utils.creditcard.validateNumber('411a343432dasd') === false);
console.log(utils.creditcard.validateNumber('4111 1111 1111 1111') === false);
console.log(utils.creditcard.validateNumber(4111111111111111) === false);

console.log(utils.creditcard.validateSecurityCode('09') === false);
console.log(utils.creditcard.validateSecurityCode('A12') === false);
console.log(utils.creditcard.validateSecurityCode('1 2 3') === false);
console.log(utils.creditcard.validateSecurityCode('347') === true);
console.log(utils.creditcard.validateSecurityCode(347) === false);
console.log(utils.creditcard.validateSecurityCode('347234234') === false);

console.log(utils.creditcard.validateName('Nik Sumeiko') === true);
console.log(utils.creditcard.validateName('NikSumeiko') === false);
console.log(utils.creditcard.validateName('Nik Sumeiko II') === true);
console.log(utils.creditcard.validateName('Nik Sumeiko 2') === false);
console.log(utils.creditcard.validateName('    ') === false);

console.log(utils.creditcard.validateDate('2014-04') === false);
console.log(utils.creditcard.validateDate('2014-07') === true);
console.log(utils.creditcard.validateDate('201404') === false);
console.log(utils.creditcard.validateDate(201407) === false);
console.log(utils.creditcard.validateDate('') === false);

I see you have finalised utils.creditcard.validateDate method. This means we have finished the exercise successfully. Congratulations!

Truly intelligent programmers reuse existing things a lot (even they are built by others). They invent new programs only when really required.

From now on you will be able to validate credit cards, when you have a project that requires credit card validation on the client. Keep your creations under control and reuse them.