Swift - Repeating Code Using Loops(while loop, Array, removeAtIndex method, inout(Closures, Function), immutable)

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) 12.をSwiftで考えてみる。

9.10(Exercises) 12.

コード(Xcode)

main.swift

//
//  main.swift
//  sample12
//
//  Created by kamimura on 9/14/14.
//  Copyright (c) 2014 kamimura. All rights reserved.
//

import Foundation

func removeNeg(inout num_array:[Int]) {
    var i:Int = 0
    while i < num_array.count {
        if num_array[i] < 0 {
            num_array.removeAtIndex(i)
        } else {
            i += 1
        }
    }
}

var numbers1:[Int] = [-5, 1, -3, 2]
var numbers2:[Int] = [-1, -3]

removeNeg(&numbers1)
removeNeg(&numbers2)

println(numbers1)
println(numbers2)

入出力結果(Console Output)

[1, 2]
[]
Program ended with exit code: 0