開発環境
- OS X Mavericks - Apple(OS)
- Xcode 6.0 Beta 6
- Swift (プログラミング言語)
Head First C ―頭とからだで覚えるCの基本(David Griffiths (著)、Dawn Griffiths (著) 中田 秀基(監訳)(翻訳)、木下 哲也 (翻訳)、オライリージャパン)の7章(高度な関数: 関数を最大限に活用する)、コードマグネット(p.313)をSwiftで考えてみる。
コードマグネット(p.313)
コード(Xcode)
main.swift
// // main.swift // sample313 // // Created by kamimura on 9/6/14. // Copyright (c) 2014 kamimura. All rights reserved. // import Foundation let ads:[String] = [ "William: SBM GSHO likes sports, TV, dining", "Matt: SUM NS likes art, movies, theater", "Luis: SLM ND likes books, theater, art", "Mike: DWM DS likes trucks, sports and bieber", "Peter: SAM likes chess, working out and art", "Josh: SJM likes sports, movies and theater", "Jed: DBM likes theater, books and dining" ] func find() { println("検索結果:") println("-" * 50) for ad in ads { if ad.find("sports") != -1 && ad.find("bieber") == -1 { println(ad) } } println("-" * 50) } find()
string.swift
// // string.swift // string // // Created by kamimura on 8/10/14. // Copyright (c) 2014 kamimura. All rights reserved. // import Foundation extension String { var swapcaseString:String { var result: String = "" for ch in self { let s = String(ch) result += s.uppercaseString == s ? s.lowercaseString : s.uppercaseString } return result } var isUpper:Bool { return self.uppercaseString == self } var isLower:Bool { return self.lowercaseString == self } var length:Int { return (self as NSString).length } var strip:String { return self.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet())} var floatValue:Float { return (self as NSString).floatValue } var doubleValue:Double { return (self as NSString).doubleValue } func count(sub:String) -> Int { var result:Int = 0 var s = self let index:String.Index = "a".endIndex while s != "" { if s.hasPrefix(sub) { result += 1 s = s.substringFromIndex(sub.endIndex) } else { s = s.substringFromIndex(index) } } return result } func find(sub:String, start:Int = 0, end:Int? = nil) -> Int { var s = self as NSString var s_temp = s.substringFromIndex(start) let end_temp:Int = end != nil ? end! : s.length for i in start..<end_temp { if (s_temp.hasPrefix(sub)) { return i } s_temp = s.substringFromIndex(i + 1) as NSString } return -1 } func indexAt(i:Int) -> String { if i >= 0 { return (self as NSString).substringWithRange(NSRange(location: i, length: 1)) } let new_i = self.length + i return (self as NSString).substringWithRange(NSRange(location: new_i, length: 1)) } func replace(old_str:String, new_str:String) -> String { return self.stringByReplacingOccurrencesOfString(old_str, withString: new_str) } func slice(start:Int=0, end:Int?=nil) -> String { let s = self as NSString var new_end:Int if (end != nil) { new_end = end! } else { new_end = s.length } return s.substringWithRange(NSRange(location: start, length:new_end - start)) } func split(sep:String = "") -> [String] { var result:[String] = [] if (sep == "") { for ch in self { result.append(String(ch)) } return result } var s:String = self var len = sep.length var temp:String = "" while s != "" { if s.hasPrefix(sep) { if temp != "" { result.append(temp) temp = "" } s = s.slice(start: len) } else { temp += s.slice(start: 0, end: 1) s = s.slice(start: 1) } } if temp != "" { result.append(temp) } return result } var reversed:String { return "".join(self.split().reverse()) } func repeat(n:Int) -> String { var result:String = "" for i in 0..<n { result += self } return result } } func * (left:String, right:Int) -> String{ return left.repeat(right) } func * (left:Int, right:String) -> String{ return right.repeat(left) }
入出力結果(Console Output, Terminal)
検索結果: -------------------------------------------------- William: SBM GSHO likes sports, TV, dining Josh: SJM likes sports, movies and theater -------------------------------------------------- Program ended with exit code: 0
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