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  • iOS: 学习笔记, swift扩展

    //
    //  YYExtension.swift
    //
    //  Created by yao_yu on 14-7-18.
    //  Copyright (c) 2014年 yao_yu. All rights reserved.
    //
    
    import Foundation
    
    extension String{
        func strip() -> String{
            return stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet())
        }
        
        func split(separator: String) -> [String]{
            return componentsSeparatedByString(separator)
        }
        
        var doubleValue:Double!{
        return (self as NSString).doubleValue
        }
        
        var length:Int{
        return countElements(self)
        }
        
        func isValidRange(range: Range<Int>) -> Bool{
            return range.startIndex >= 0 && range.endIndex <= length
        }
        
        subscript (range: Range<Int>) -> String {
            assert(isValidRange(range), "范围超出字符串长度")
                var startIndex:String.Index = advance(self.startIndex, range.startIndex)
                var endIndex:String.Index = advance(startIndex, range.endIndex - range.startIndex)
                return self.substringWithRange(Range(start: startIndex, end: endIndex))
        }
        
        subscript (index: Int) -> String{
            return self[index...index]
        }
        
        func at (indexes: Int...) -> [String] {
            return indexes.map { self[$0] }
        }
        
        func at (indexes: [Int]) -> [String] {
            return indexes.map { self[$0] }
        }
    }
    
    extension Array {
        func take(n: Int) -> SliceType{
            return self[0 ..< n]
        }
        
        func tail (n: Int) -> SliceType {
            return self[(count - n) ..< count]
        }
        
        func skip (n: Int) -> SliceType {
            return self[n ..< count]
        }
    }
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  • 原文地址:https://www.cnblogs.com/yaoyu126/p/3856255.html
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