Swift - Repeating Code Using Loops(nested array, for loop(for/in), append method, empty array)

The Swift Programming Language
Apple Inc.

開発環境

• OS X Mavericks - Apple(OS)
• Xcode 6.0 Beta 6
• Swift (プログラミング言語)

Practical Programming: An Introduction to Computer Science Using Python 3 (Pragmatic Programmers) (Paul Gries (著)、Jennifer Campbell (著)、Jason Montojo (著)、Lynn Beighley (編集)、Pragmatic Bookshelf)のChapter 9(Repeating Code Using Loops)、9.10(Exercises) 4.をSwiftで考えてみる。

9.10(Exercises) 4.

コード(Xcode)

main.swift

//
//  main.swift
//  sample4
//
//  Created by kamimura on 9/5/14.
//  Copyright (c) 2014 kamimura. All rights reserved.
//

import Foundation

println("a.")
let alkaline_earth_metals = [[4, 9.012], [12, 24.305], [20, 40.078], [38, 87.62], [56, 137.327], [88, 226]]
println(alkaline_earth_metals)

println("b.")
for metal in alkaline_earth_metals {
    println(metal[0])
    println(metal[1])
}

println("c.")
var number_and_weight:[AnyObject] = []

for metal in alkaline_earth_metals {
    number_and_weight.append(metal[0])
    number_and_weight.append(metal[1])
}

println(number_and_weight)

入出力結果(Console Output)

a.
[(
    4,
    "9.012"
), (
    12,
    "24.305"
), (
    20,
    "40.078"
), (
    38,
    "87.62"
), (
    56,
    "137.327"
), (
    88,
    226
)]
b.
4
9.012
12
24.305
20
40.078
38
87.62
56
137.327
88
226
c.
[4, 9.012, 12, 24.305, 20, 40.078, 38, 87.62, 56, 137.327, 88, 226]
Program ended with exit code: 0