simpleprogrammer-shared

// In fighting code
switch(classType)
{
    case WARRIOR:
          swingSword();
          break;
    case MAGE:
          castSpell();
          break;
    case THIEF:

simpleprogrammer-shared

public interface CharacterClass
{
    void Attack();
    ArmorResponse WearArmor(armor);
}

simpleprogrammer-shared

public class Warrior : CharacterClass
{
    void Attack()
    {
       swingSword();
    }
 
    ArmorResponse WearArmor(armor)
    {
       return CAN_WEAR;

simpleprogrammer-shared

public Dictionary characterDictionary =
    new Dictionary {
    { WARRIOR, new Warrior() },
    { MAGE, new Mage() },
    { THIEF, new Thief() }
};

simpleprogrammer-shared

// In fighting code
myCharacter.Attack();
 
// In wear armor code
var armorResponse =  myCharacter.WearArmor(armor);

simpleprogrammer-shared

public class CurrencyConverter
{
    CurrencyConverter(ICurrency destinationCurrency)
    { ... }
 
    ICurrency Convert(ICurrency sourceCurrency, decimal amount);
    { ... }
}

simpleprogrammer-shared

public interface ICurrency
{
    ConvertUsing(CurrencyConverter converter);
}

simpleprogrammer-shared

SELECT *
FROM
 orders o
 JOIN customers c
    ON o.customerid = c.customerid
WHERE
 c.companyname = 'Around the Horn'

simpleprogrammer-shared

SELECT *
FROM
  orders o
  CROSS APPLY (
    SELECT *  FROM
       customers c
    WHERE
       o.customerid = c.customerid) AS c
WHERE
  c.companyname = 'Around the Horn'

simpleprogrammer-shared

SELECT *
FROM
    orders o
    CROSS APPLY (SELECT *
                 FROM
                     customers c
                 WHERE
                     o.customerid = c.customerid) AS c
WHERE
    c.companyname = 'Around the Horn'