「リファクタリング 第2版」Swiftでコーディング その6
リファクタリング 第2版
11-12頁 第1章 play変数の削除 「変数のインライン化(p.129)」
Swift版 main.swift
データ生成、結果表示付き。
import Foundation A makeData() func playFor(aPerformance:Performance) -> Play { return plays[aPerformance.playID]! } func statement(invoice:Invoice, plays:Dictionary<String, Play>) -> String { var volumeCredits = 0 var totalAmount = 0 var result = "Statement for \(invoice.customer)\n" let format = NumberFormatter() format.numberStyle = .currency format.locale = Locale(identifier: "en_US") for perf in invoice.performances { let thisAcmount = amountFor(aPerformance: perf, play: playFor(aPerformance: perf)) volumeCredits += max(perf.audience - 30, 0) if "comedy" == playFor(aPerformance: perf).type { volumeCredits += Int(perf.audience / 5) } result += " \(playFor(aPerformance: perf).name): " + format.string(from: NSNumber(value: thisAcmount / 100))! + " (\(perf.audience) seats)\n" totalAmount += thisAcmount } result += "Amount owed is " + format.string(from: NSNumber(value: totalAmount / 100))! + "\n" result += "You earned \(volumeCredits) credits\n" return result } func amountFor(aPerformance:Performance, play:Play) -> Int { var result = 0 switch play.type { case "tragedy": result = 40000 if aPerformance.audience > 30 { result += 1000 * (aPerformance.audience - 30) } case "comedy": result = 30000 if aPerformance.audience > 20 { result += 10000 + 500 * (aPerformance.audience - 20) } result += 300 * aPerformance.audience default: print("error") } return result } let result = statement(invoice: invoices[0], plays: plays) print(result)