此代码来自另一个在swift版本1或2中运行但之前不再有效的项目.

import Foundation

extension String {

    func split() -> [String] {
        return self.componentsSeparatedByCharactersInSet(
            CharacterSet.whitespaceAndNewlineCharacterSet())
            .filter({$0 != ""});
    }
}

extension Array {

    func unique<T: Equatable>() -> [T] {
        var uniqueValues = [T]();

        for value in self {
            if !contains(uniqueValues,value as T) {
                uniqueValues.append(value as! T);
            }
        }
        return uniqueValues;
    }

    func first<T>(test:(T) -> Bool) -> T? {
        for value in self {
            if test(value as! T) {
                return value as? T;
            }
        }
        return nil;
    }
}