arrays - 外部数组不受函数追加的影响

Question

我正在处理数组，我创建了一个从内部追加数组的函数。但是，当我打印数组时，它仍然显示为空。给了什么？

    var queriesFinal : [String] = []

func queryValidator(search : String)
{
    var letterSet = NSCharacterSet(charactersInString: "abcdefgjhijklmnopqrstuvwxyz ")
    var numberSet = NSCharacterSet(charactersInString: "1234567890".uppercaseString)
    var queriesTwo : [String] = search.lowercaseString.componentsSeparatedByCharactersInSet(letterSet)

    for(var x = 0; x < queriesTwo.count; x++)
    {
        for(var y = 0; y < 10; y++)
        {
            var str = String(y)
            if(queriesTwo[x] == str)
            {
                var numberStr = String(queriesTwo[x]) + "th"
                queriesFinal.append(numberStr)
            }
        }
    }
}


println(queriesFinal)

search = "Matt 8th"

queryValidator(search)

这段代码可以在 Playground 上运行..

感谢您的帮助!

Answer 1

正如 Mike S 所提到的，你犯了一个小错误 println 应该在你的 queryValidator 之后，我还添加了一个可选的以防你的 queryValidator 搜索返回 nil，同样正如 Zaph 所提到的你不需要 numberSet，所以我删除了它:

func queryValidator(search : String) -> [String]? {
    let queriesTwo:[String] = search.lowercaseString.componentsSeparatedByCharactersInSet(NSCharacterSet(charactersInString: "abcdefgjhijklmnopqrstuvwxyz "))
    var queriesResult:[String] = []
    for x in 0...queriesTwo.count-1 {
        for y in 0...9 {
            if(queriesTwo[x] == String(y)) {
                queriesResult.append(String(queriesTwo[x]) + "th")
            }
        }
    }
    return queriesResult.count > 0 ? queriesResult : nil
}
var search = "Matt 8 less7"
if let queriesFinal = queryValidator(search) {
    println(queriesFinal)
} else {
    println("no result")
}