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extension Dictionary {
    func valuesForKeys(keys: [Key])->[Value?]{
        var result = [Value?]()
        result.reserveCapacity(keys.count)
        for key in keys{
            result.append(self[key])
        }
        return result
    }
}

// Implementation
var dic = [
            "A" : "Apple",
            "B" : "Banana",
            "C" : "Clemon",
            "D" : "Date"
        ]
let values = dic.valuesForKey(["A","D"])
// Output : [Apple,Date]