ciryon

func vend(itemNamed name: String) throws {
    let item = try validatedItemNamed(name)
    reduceDepositedCoinsBy(item.price)
    removeFromInventory(item, name: name)
    dispense(name)
}

private func validatedItemNamed(name: String) throws -> Item {
    let item = try itemNamed(name)
    try validate(item)

ciryon

Keybase proof

I hereby claim:

• I am ciryon on github.
• I am ciryon (https://keybase.io/ciryon) on keybase.
• I have a public key ASDhUuEPIoguTlRZRA_KXtJWdqLW7jknzuklzlukIq0mYgo

To claim this, I am signing this object: