hasContact() function

[cjuhong]

var hasContact = function(account, contactId) {
if ( null == account.contacts ) return false;

account.contacts.forEach(function(contact) {
  if ( contact.accountId == contactId ) {
    return true;
  }
});
return false;

};

in chapter08, the hasContact function would never return true!!!

[cjuhong]

the forEach method is not suitable for this situation.