Swift - Putting Some Order in Your Data: Arrays(parallel arrays, index)

The Swift Programming Language
Apple Inc.

開発環境

• OS X Mavericks - Apple(OS)
• Xcode 6.0 Beta
• Swift (プログラミング言語)

Head First JavaScript Programming (Eric T. Freeman (著)、 Elisabeth Robson (著)、 O'Reilly Media )のChapter 4(Putting Some Order in Your Data: Arrays)、EXERCISE(p.164)をSwiftで考えてみる。

EXERCISE(p.164)

コード(Xcode)

main.swift

//
//  main.swift
//  sample164
//
//  Created by kamimura on 8/10/14.
//  Copyright (c) 2014 kamimura. All rights reserved.
//

import Foundation

var scores:[Int] = [
    60, 50, 60, 58, 54, 54, 58, 50, 52, 54,
    48, 69, 34, 55, 51, 52, 44, 51, 69, 64,
    66, 55, 52, 61, 46, 31, 57, 52, 44, 18,
    41, 53, 55, 61, 51, 44
]

var costs:[Float] = [
    0.25, 0.27, 0.25, 0.25, 0.25, 0.25, 0.33, 0.31, 0.25, 0.29, 0.27, 0.22, 0.31,
    0.25, 0.25, 0.33, 0.21, 0.25, 0.25, 0.25, 0.28, 0.25, 0.24, 0.22, 0.20, 0.25,
    0.30, 0.25, 0.24, 0.25, 0.25, 0.25, 0.27, 0.25, 0.26, 0.29
]

func printAndGetHighScores(scores:[Int]) -> Int {
    var high_score :Int = 0
    var score:Int
    for i in 0..<scores.endIndex {
        score = scores[i]
        let output:String = "Bubble solution #\(i) score: \(score)"
        println(output)
        if (score > high_score) {
            high_score = score
        }
    }
    return high_score
}

func getMostCostEffectiveSolution(scores:[Int], costs:[Float], highScore:Int) -> Int {
    var cost:Float = 100
    var index:Int = 0
    
    for i in 0..<scores.count {
        if scores[i] == highScore {
            if cost > costs[i] {
                index = i
                cost = costs[i]
            }
        }
    }
    return index
}

let highScore = printAndGetHighScores(scores)
let mostCostEffective = getMostCostEffectiveSolution(scores, costs, highScore)
println("Bubble Solution #\(mostCostEffective) is the most cost effective")

入出力結果(Console Output)

Bubble solution #0 score: 60
Bubble solution #1 score: 50
Bubble solution #2 score: 60
Bubble solution #3 score: 58
Bubble solution #4 score: 54
Bubble solution #5 score: 54
Bubble solution #6 score: 58
Bubble solution #7 score: 50
Bubble solution #8 score: 52
Bubble solution #9 score: 54
Bubble solution #10 score: 48
Bubble solution #11 score: 69
Bubble solution #12 score: 34
Bubble solution #13 score: 55
Bubble solution #14 score: 51
Bubble solution #15 score: 52
Bubble solution #16 score: 44
Bubble solution #17 score: 51
Bubble solution #18 score: 69
Bubble solution #19 score: 64
Bubble solution #20 score: 66
Bubble solution #21 score: 55
Bubble solution #22 score: 52
Bubble solution #23 score: 61
Bubble solution #24 score: 46
Bubble solution #25 score: 31
Bubble solution #26 score: 57
Bubble solution #27 score: 52
Bubble solution #28 score: 44
Bubble solution #29 score: 18
Bubble solution #30 score: 41
Bubble solution #31 score: 53
Bubble solution #32 score: 55
Bubble solution #33 score: 61
Bubble solution #34 score: 51
Bubble solution #35 score: 44
Bubble Solution #11 is the most cost effective
Program ended with exit code: 0