配列を辞書に変換

ArrayToDict.swift

        // [[String]] -> [String: String]
        let params = [
            ["key1", "value4"],
            ["key2", "value5"],
            ["key3", "value6"],
        ]
        
        let b = params.reduce([String:String]()) { (query, param) -> [String:String] in
            var q = query
            q.updateValue(param[1], forKey: param[0])
            return q
        }
        
        // $ print(b)
        // -> ["key3": "value6", "key1": "value4", "key2": "value5"]