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Improve ATM extensibility by replacing fixed properties with a dynamic list #131

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Improve ATM extensibility by replacing fixed properties with a dynamic list #131

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20 changes: 5 additions & 15 deletions source-cn/behavioral/chain_of_responsibility.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -57,24 +57,14 @@ final class MoneyPile: Withdrawing {

final class ATM: Withdrawing {

private var hundred: Withdrawing
private var fifty: Withdrawing
private var twenty: Withdrawing
private var ten: Withdrawing
private var moneyPiles: [Withdrawing]

private var startPile: Withdrawing {
return self.hundred
return self.moneyPiles.first!
}

init(hundred: Withdrawing,
fifty: Withdrawing,
twenty: Withdrawing,
ten: Withdrawing) {

self.hundred = hundred
self.fifty = fifty
self.twenty = twenty
self.ten = ten
init(moneyPiles: [Withdrawing]) {
self.moneyPiles = moneyPiles
}

func withdraw(amount: Int) -> Bool {
Expand All @@ -91,6 +81,6 @@ let fifty = MoneyPile(value: 50, quantity: 2, next: twenty)
let hundred = MoneyPile(value: 100, quantity: 1, next: fifty)

// 创建 ATM 实例
var atm = ATM(hundred: hundred, fifty: fifty, twenty: twenty, ten: ten)
var atm = ATM(moneyPiles: [hundred, fifty, twenty, ten])
atm.withdraw(amount: 310) // Cannot because ATM has only 300
atm.withdraw(amount: 100) // Can withdraw - 1x100
20 changes: 5 additions & 15 deletions source/behavioral/chain_of_responsibility.swift
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -57,24 +57,14 @@ final class MoneyPile: Withdrawing {

final class ATM: Withdrawing {

private var hundred: Withdrawing
private var fifty: Withdrawing
private var twenty: Withdrawing
private var ten: Withdrawing
private var moneyPiles: [Withdrawing]

private var startPile: Withdrawing {
return self.hundred
return self.moneyPiles.first!
}

init(hundred: Withdrawing,
fifty: Withdrawing,
twenty: Withdrawing,
ten: Withdrawing) {

self.hundred = hundred
self.fifty = fifty
self.twenty = twenty
self.ten = ten
init(moneyPiles: [Withdrawing]) {
self.moneyPiles = moneyPiles
}

func withdraw(amount: Int) -> Bool {
Expand All @@ -91,6 +81,6 @@ let fifty = MoneyPile(value: 50, quantity: 2, next: twenty)
let hundred = MoneyPile(value: 100, quantity: 1, next: fifty)

// Build ATM.
var atm = ATM(hundred: hundred, fifty: fifty, twenty: twenty, ten: ten)
var atm = ATM(moneyPiles: [hundred, fifty, twenty, ten])
atm.withdraw(amount: 310) // Cannot because ATM has only 300
atm.withdraw(amount: 100) // Can withdraw - 1x100