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@guijiu(taka kuwa)

kotlinで型推論がどのように推論し、また変数名と引数名がどのように対応しているか調べてみた。

Last updated at Posted at 2021-01-01

　以下、力任せにに色々と記述しましたが、まず@uasiさんから頂いたコメントの型推論の中の「３つバリエーション」を読むことをお勧めします。
＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃
　先だって、Qiitaやteratailで関数型について質問したところ、三者三様の回答をいただきました。
　よくよく見てみると型推論をどこまで(どのように)適用するかの違いと気づきました。そこで考えられるだけの事例を総当たりで試してみました。
　以下のコードを調べてみて、私自身では傾向がつかめたのですが、文書にまとめられませんでした。以下に張り付けたコードは、違いが分かりやすいようにコードを折り返すことなく列挙して配置していますので、横長になり画面からはみ出して見づらくなっています。もし、興味のある方は、intelliJなどのIDEにコピーしてコメントアウトを外して御確認ください。
　以下のコードでコメントアウト(//)している個所は、エラーが出たコードです。その他のコードは同じ結果が得られます。（なお、このコードは、Map型で与えられた文字列（キー）と数値（バリュー）のペアを入れ替え数値をキー、文字列をバリューに組み替えたものを出力します。）
　但し、ダブルコメントアウト(////)した部分は、@uasiさんにコメントを頂いた箇所を修正しました。（所謂、バグを埋め込んだ例です。この辺りも教訓として御覧いただければ、、、）コメントアウトせず残っているコードは、次のチェックを掛けてtrueを得ています。もし、型推論の使い方など誤りがあれば、ぜひご指摘ください。

    println( flipValues00(mapOf("Tom" to 9.0)) != mapOf(4.0 to "Josh", 2.0 to "Alex", 3.0 to "Jane") )

　一番関数型らしい記述は、@ttatsfさんに教えていただいた、最後の方のflipValue98だと思います。

FlipValues.kt
package FV3

fun main() {
    val gradesByStudentA = mapOf("Josh" to 4.0, "Alex" to 2.0, "Jane" to 3.0)
    println(gradesByStudentA)


    val flipValues00 :  ( gradesByStudentA : Map<String, Double>) -> Map<Double, String> = { gradesByStudentA : Map<String, Double> -> gradesByStudentA .map { it.value to it.key }.toMap() }
    val flipValues01 :  ( gradesByStudentB : Map<String, Double>) -> Map<Double, String> = { gradesByStudentA : Map<String, Double> -> gradesByStudentA .map { it.value to it.key }.toMap() }
    val flipValues02 :  ( gradesByStudentC : Map<String, Double>) -> Map<Double, String> = { gradesByStudentA : Map<String, Double> -> gradesByStudentA .map { it.value to it.key }.toMap() }
////    val flipValues03 :  ( gradesByStudentA : Map<String, Double>) -> Map<Double, String> = { gradesByStudentB : Map<String, Double> -> gradesByStudentA .map { it.value to it.key }.toMap() }   // バグを埋め込んでいる例 @uasiさんコメント参照
////    val flipValues04 :  ( gradesByStudentB : Map<String, Double>) -> Map<Double, String> = { gradesByStudentB : Map<String, Double> -> gradesByStudentA .map { it.value to it.key }.toMap() }   // バグを埋め込んでいる例 @uasiさんコメント参照
////    val flipValues05 :  ( gradesByStudentC : Map<String, Double>) -> Map<Double, String> = { gradesByStudentB : Map<String, Double> -> gradesByStudentA .map { it.value to it.key }.toMap() }   // バグを埋め込んでいる例 @uasiさんコメント参照
    ////val flipValues06 :  ( gradesByStudentA : Map<String, Double>) -> Map<Double, String> = { gradesByStudentC : Map<String, Double> -> gradesByStudentA .map { it.value to it.key }.toMap() }   // バグを埋め込んでいる例 @uasiさんコメント参照
    ////val flipValues07 :  ( gradesByStudentB : Map<String, Double>) -> Map<Double, String> = { gradesByStudentC : Map<String, Double> -> gradesByStudentA .map { it.value to it.key }.toMap() }   // バグを埋め込んでいる例 @uasiさんコメント参照
    ////val flipValues08 :  ( gradesByStudentC : Map<String, Double>) -> Map<Double, String> = { gradesByStudentC : Map<String, Double> -> gradesByStudentA .map { it.value to it.key }.toMap() }   // バグを埋め込んでいる例 @uasiさんコメント参照
//    val flipValues09 :  ( gradesByStudentA : Map<String, Double>) -> Map<Double, String> = { gradesByStudentA : Map<String, Double> -> gradesByStudentB .map { it.value to it.key }.toMap() }
//    val flipValues10 :  ( gradesByStudentB : Map<String, Double>) -> Map<Double, String> = { gradesByStudentA : Map<String, Double> -> gradesByStudentB .map { it.value to it.key }.toMap() }
//    val flipValues11 :  ( gradesByStudentC : Map<String, Double>) -> Map<Double, String> = { gradesByStudentA : Map<String, Double> -> gradesByStudentB .map { it.value to it.key }.toMap() }
    val flipValues12 :  ( gradesByStudentA : Map<String, Double>) -> Map<Double, String> = { gradesByStudentB : Map<String, Double> -> gradesByStudentB .map { it.value to it.key }.toMap() }
    val flipValues13 :  ( gradesByStudentB : Map<String, Double>) -> Map<Double, String> = { gradesByStudentB : Map<String, Double> -> gradesByStudentB .map { it.value to it.key }.toMap() }   // flipValues13の後ろのgradesByStudentBと、= {の後ろのgradesByStudentBは、別の変数である。
    val flipValues14 :  ( gradesByStudentC : Map<String, Double>) -> Map<Double, String> = { gradesByStudentB : Map<String, Double> -> gradesByStudentB .map { it.value to it.key }.toMap() }
//    val flipValues15 :  ( gradesByStudentA : Map<String, Double>) -> Map<Double, String> = { gradesByStudentC : Map<String, Double> -> gradesByStudentB .map { it.value to it.key }.toMap() }
//    val flipValues16 :  ( gradesByStudentB : Map<String, Double>) -> Map<Double, String> = { gradesByStudentC : Map<String, Double> -> gradesByStudentB .map { it.value to it.key }.toMap() }
//    val flipValues17 :  ( gradesByStudentC : Map<String, Double>) -> Map<Double, String> = { gradesByStudentC : Map<String, Double> -> gradesByStudentB .map { it.value to it.key }.toMap() }
//    val flipValues18 :  ( gradesByStudentA : Map<String, Double>) -> Map<Double, String> = { gradesByStudentA : Map<String, Double> -> gradesByStudentC .map { it.value to it.key }.toMap() }
//    val flipValues19 :  ( gradesByStudentB : Map<String, Double>) -> Map<Double, String> = { gradesByStudentA : Map<String, Double> -> gradesByStudentC .map { it.value to it.key }.toMap() }
//    val flipValues20 :  ( gradesByStudentC : Map<String, Double>) -> Map<Double, String> = { gradesByStudentA : Map<String, Double> -> gradesByStudentC .map { it.value to it.key }.toMap() }
//    val flipValues21 :  ( gradesByStudentA : Map<String, Double>) -> Map<Double, String> = { gradesByStudentB : Map<String, Double> -> gradesByStudentC .map { it.value to it.key }.toMap() }
//    val flipValues22 :  ( gradesByStudentB : Map<String, Double>) -> Map<Double, String> = { gradesByStudentB : Map<String, Double> -> gradesByStudentC .map { it.value to it.key }.toMap() }
//    val flipValues23 :  ( gradesByStudentC : Map<String, Double>) -> Map<Double, String> = { gradesByStudentB : Map<String, Double> -> gradesByStudentC .map { it.value to it.key }.toMap() }
    val flipValues24 :  ( gradesByStudentA : Map<String, Double>) -> Map<Double, String> = { gradesByStudentC : Map<String, Double> -> gradesByStudentC .map { it.value to it.key }.toMap() }   //flipValues12と同じ形式
    val flipValues25 :  ( gradesByStudentB : Map<String, Double>) -> Map<Double, String> = { gradesByStudentC : Map<String, Double> -> gradesByStudentC .map { it.value to it.key }.toMap() }   //flipValues13と同じ形式
    val flipValues26 :  ( gradesByStudentC : Map<String, Double>) -> Map<Double, String> = { gradesByStudentC : Map<String, Double> -> gradesByStudentC .map { it.value to it.key }.toMap() }   //flipValues14と同じ形式



    val flipValues30 :  ( gradesByStudentA : Map<String, Double>) -> Map<Double, String> = { gradesByStudentA                       -> gradesByStudentA .map { it.value to it.key }.toMap() }
    val flipValues31 :  ( gradesByStudentB : Map<String, Double>) -> Map<Double, String> = { gradesByStudentA                       -> gradesByStudentA .map { it.value to it.key }.toMap() }
    val flipValues32 :  ( gradesByStudentC : Map<String, Double>) -> Map<Double, String> = { gradesByStudentA                       -> gradesByStudentA .map { it.value to it.key }.toMap() }
    ////val flipValues33 :  ( gradesByStudentA : Map<String, Double>) -> Map<Double, String> = { gradesByStudentB                       -> gradesByStudentA .map { it.value to it.key }.toMap() }   // バグを埋め込んでいる例 @uasiさんコメント参照
    ////val flipValues34 :  ( gradesByStudentB : Map<String, Double>) -> Map<Double, String> = { gradesByStudentB                       -> gradesByStudentA .map { it.value to it.key }.toMap() }   // バグを埋め込んでいる例 @uasiさんコメント参照
    ////val flipValues35 :  ( gradesByStudentC : Map<String, Double>) -> Map<Double, String> = { gradesByStudentB                       -> gradesByStudentA .map { it.value to it.key }.toMap() }   // バグを埋め込んでいる例 @uasiさんコメント参照
    ////val flipValues36 :  ( gradesByStudentA : Map<String, Double>) -> Map<Double, String> = { gradesByStudentC                       -> gradesByStudentA .map { it.value to it.key }.toMap() }   // バグを埋め込んでいる例 @uasiさんコメント参照
    ////val flipValues37 :  ( gradesByStudentB : Map<String, Double>) -> Map<Double, String> = { gradesByStudentC                       -> gradesByStudentA .map { it.value to it.key }.toMap() }   // バグを埋め込んでいる例 @uasiさんコメント参照
    ////val flipValues38 :  ( gradesByStudentC : Map<String, Double>) -> Map<Double, String> = { gradesByStudentC                       -> gradesByStudentA .map { it.value to it.key }.toMap() }   // バグを埋め込んでいる例 @uasiさんコメント参照
//    val flipValues39 :  ( gradesByStudentA : Map<String, Double>) -> Map<Double, String> = { gradesByStudentA                       -> gradesByStudentB .map { it.value to it.key }.toMap() }
//    val flipValues40 :  ( gradesByStudentB : Map<String, Double>) -> Map<Double, String> = { gradesByStudentA                       -> gradesByStudentB .map { it.value to it.key }.toMap() }
//    val flipValues41 :  ( gradesByStudentC : Map<String, Double>) -> Map<Double, String> = { gradesByStudentA                       -> gradesByStudentB .map { it.value to it.key }.toMap() }
    val flipValues42 :  ( gradesByStudentA : Map<String, Double>) -> Map<Double, String> = { gradesByStudentB                       -> gradesByStudentB .map { it.value to it.key }.toMap() }
    val flipValues43 :  ( gradesByStudentB : Map<String, Double>) -> Map<Double, String> = { gradesByStudentB                       -> gradesByStudentB .map { it.value to it.key }.toMap() }
    val flipValues44 :  ( gradesByStudentC : Map<String, Double>) -> Map<Double, String> = { gradesByStudentB                       -> gradesByStudentB .map { it.value to it.key }.toMap() }
//    val flipValues45 :  ( gradesByStudentA : Map<String, Double>) -> Map<Double, String> = { gradesByStudentC                       -> gradesByStudentB .map { it.value to it.key }.toMap() }
//    val flipValues46 :  ( gradesByStudentB : Map<String, Double>) -> Map<Double, String> = { gradesByStudentC                       -> gradesByStudentB .map { it.value to it.key }.toMap() }
//    val flipValues47 :  ( gradesByStudentC : Map<String, Double>) -> Map<Double, String> = { gradesByStudentC                       -> gradesByStudentB .map { it.value to it.key }.toMap() }
//    val flipValues48 :  ( gradesByStudentA : Map<String, Double>) -> Map<Double, String> = { gradesByStudentA                       -> gradesByStudentC .map { it.value to it.key }.toMap() }
//    val flipValues49 :  ( gradesByStudentB : Map<String, Double>) -> Map<Double, String> = { gradesByStudentA                       -> gradesByStudentC .map { it.value to it.key }.toMap() }
//    val flipValues50 :  ( gradesByStudentC : Map<String, Double>) -> Map<Double, String> = { gradesByStudentA                       -> gradesByStudentC .map { it.value to it.key }.toMap() }
//    val flipValues51 :  ( gradesByStudentA : Map<String, Double>) -> Map<Double, String> = { gradesByStudentB                       -> gradesByStudentC .map { it.value to it.key }.toMap() }
//    val flipValues52 :  ( gradesByStudentB : Map<String, Double>) -> Map<Double, String> = { gradesByStudentB                       -> gradesByStudentC .map { it.value to it.key }.toMap() }
//    val flipValues53 :  ( gradesByStudentC : Map<String, Double>) -> Map<Double, String> = { gradesByStudentB                       -> gradesByStudentC .map { it.value to it.key }.toMap() }
    val flipValues54 :  ( gradesByStudentA : Map<String, Double>) -> Map<Double, String> = { gradesByStudentC                       -> gradesByStudentC .map { it.value to it.key }.toMap() }
    val flipValues55 :  ( gradesByStudentB : Map<String, Double>) -> Map<Double, String> = { gradesByStudentC                       -> gradesByStudentC .map { it.value to it.key }.toMap() }
    val flipValues56 :  ( gradesByStudentC : Map<String, Double>) -> Map<Double, String> = { gradesByStudentC                       -> gradesByStudentC .map { it.value to it.key }.toMap() }
                          
    val flipValues70                                                                     = { gradesByStudentA : Map<String, Double> -> gradesByStudentA .map { it.value to it.key }.toMap() }
    ////val flipValues71                                                                     = { gradesByStudentB : Map<String, Double> -> gradesByStudentA .map { it.value to it.key }.toMap() }   // バグを埋め込んでいる例 @uasiさんコメント参照
//    val flipValues72                                                                     = { gradesByStudentA : Map<String, Double> -> gradesByStudentB .map { it.value to it.key }.toMap() }
    val flipValues73                                                                     = { gradesByStudentB : Map<String, Double> -> gradesByStudentB .map { it.value to it.key }.toMap() }

    ////val flipValues80 :  ( gradesByStudentA : Map<String, Double>) -> Map<Double, String> = {                                           gradesByStudentA .map { it.value to it.key }.toMap() }   // バグを埋め込んでいる例 @uasiさんコメント参照
    ////val flipValues81 :  ( gradesByStudentB : Map<String, Double>) -> Map<Double, String> = {                                           gradesByStudentA .map { it.value to it.key }.toMap() }   // バグを埋め込んでいる例 @uasiさんコメント参照
//    val flipValues82 :  ( gradesByStudentA : Map<String, Double>) -> Map<Double, String> = {                                           gradesByStudentB .map { it.value to it.key }.toMap() }
//    val flipValues83 :  ( gradesByStudentB : Map<String, Double>) -> Map<Double, String> = {                                           gradesByStudentB .map { it.value to it.key }.toMap() }
//    val flipValues84 :  ( gradesByStudentB : Map<String, Double>) -> Map<Double, String> =                                             gradesByStudentA .map { it.value to it.key }.toMap()

//    val flipValues90                                                                     = {                                           gradesByStudentA  .map { it.value to it.key }.toMap() }
//    val flipValues91                                                                     = {                                           gradesByStudentB  .map { it.value to it.key }.toMap() }

//    val flipValues92 :  ( gradesByStudentA )                                             = { gradesByStudentA : Map<String, Double> -> gradesByStudentA .map { it.value to it.key }.toMap() }
//    val flipValues93 :  ( gradesByStudentA : Map<String, Double>)                        = { gradesByStudentA : Map<String, Double> -> gradesByStudentA .map { it.value to it.key }.toMap() }
//    val flipValues94 :  ( gradesByStudentA :                      -> Map<Double, String> = { gradesByStudentA : Map<String, Double> -> gradesByStudentA .map { it.value to it.key }.toMap() }
//    val flipValues95 :  ( gradesByStudentA :                         Map<Double, String> = { gradesByStudentA : Map<String, Double> -> gradesByStudentA .map { it.value to it.key }.toMap() }
//    val flipValues96 :  ( gradesByStudentA                           Map<Double, String> = { gradesByStudentA : Map<String, Double> -> gradesByStudentA .map { it.value to it.key }.toMap() }
    val flipValues97 :  (                    Map<String, Double>) -> Map<Double, String> = {                                           gradesByStudentA .map { it.value to it.key }.toMap() }

    val flipValues98 :  (Map<String, Double>)                     -> Map<Double, String> = {                                           it               .map { it.value to it.key }.toMap() }




    println("flipValue00：${flipValues00(gradesByStudentA)}")
    println(flipValues00(mapOf("Tom" to 9.0)) != mapOf(4.0 to "Josh", 2.0 to "Alex", 3.0 to "Jane"))
    println("flipValue01：${flipValues01(gradesByStudentA)}")
    println(flipValues01(mapOf("Tom" to 9.0)) != mapOf(4.0 to "Josh", 2.0 to "Alex", 3.0 to "Jane"))
    println("flipValue02：${flipValues02(gradesByStudentA)}")
    println(flipValues02(mapOf("Tom" to 9.0)) != mapOf(4.0 to "Josh", 2.0 to "Alex", 3.0 to "Jane"))
    ////println("flipValue03：${flipValues03(gradesByStudentA)}")
    ////println(flipValues03(mapOf("Tom" to 9.0)) != mapOf(4.0 to "Josh", 2.0 to "Alex", 3.0 to "Jane"))
    ////println("flipValue04：${flipValues04(gradesByStudentA)}")
    ////println(flipValues04(mapOf("Tom" to 9.0)) != mapOf(4.0 to "Josh", 2.0 to "Alex", 3.0 to "Jane"))
    ////println("flipValue05：${flipValues05(gradesByStudentA)}")
    ////println("flipValue06：${flipValues06(gradesByStudentA)}")
    ////println("flipValue07：${flipValues07(gradesByStudentA)}")
    ////println("flipValue08：${flipValues08(gradesByStudentA)}")
//    println("flipValue09：${flipValues09(gradesByStudentA)}")
//    println("flipValue10：${flipValues10(gradesByStudentA)}")
//    println("flipValue11：${flipValues11(gradesByStudentA)}")
    println("flipValue12：${flipValues12(gradesByStudentA)}")
    println(flipValues12(mapOf("Tom" to 9.0)) != mapOf(4.0 to "Josh", 2.0 to "Alex", 3.0 to "Jane"))
    println("flipValue13：${flipValues13(gradesByStudentA)}")
    println(flipValues13(mapOf("Tom" to 9.0)) != mapOf(4.0 to "Josh", 2.0 to "Alex", 3.0 to "Jane"))
    println("flipValue14：${flipValues14(gradesByStudentA)}")
    println(flipValues14(mapOf("Tom" to 9.0)) != mapOf(4.0 to "Josh", 2.0 to "Alex", 3.0 to "Jane"))
//    println("flipValue15：${flipValues15(gradesByStudentA)}")
//    println("flipValue16：${flipValues16(gradesByStudentA)}")
//    println("flipValue17：${flipValues17(gradesByStudentA)}")
//    println("flipValue18：${flipValues18(gradesByStudentA)}")
//    println("flipValue19：${flipValues19(gradesByStudentA)}")
//    println("flipValue20：${flipValues20(gradesByStudentA)}")
//    println("flipValue21：${flipValues21(gradesByStudentA)}")
//    println("flipValue22：${flipValues22(gradesByStudentA)}")
//    println("flipValue23：${flipValues23(gradesByStudentA)}")
    println("flipValue24：${flipValues24(gradesByStudentA)}")
    println(flipValues24(mapOf("Tom" to 9.0)) != mapOf(4.0 to "Josh", 2.0 to "Alex", 3.0 to "Jane"))
    println("flipValue25：${flipValues25(gradesByStudentA)}")
    println(flipValues25(mapOf("Tom" to 9.0)) != mapOf(4.0 to "Josh", 2.0 to "Alex", 3.0 to "Jane"))
    println("flipValue26：${flipValues26(gradesByStudentA)}")
    println(flipValues26(mapOf("Tom" to 9.0)) != mapOf(4.0 to "Josh", 2.0 to "Alex", 3.0 to "Jane"))
    println("flipValue30：${flipValues30(gradesByStudentA)}")
    println(flipValues30(mapOf("Tom" to 9.0)) != mapOf(4.0 to "Josh", 2.0 to "Alex", 3.0 to "Jane"))
    println("flipValue31：${flipValues31(gradesByStudentA)}")
    println(flipValues31(mapOf("Tom" to 9.0)) != mapOf(4.0 to "Josh", 2.0 to "Alex", 3.0 to "Jane"))
    println("flipValue32：${flipValues32(gradesByStudentA)}")
    println(flipValues32(mapOf("Tom" to 9.0)) != mapOf(4.0 to "Josh", 2.0 to "Alex", 3.0 to "Jane"))
    ////println("flipValue33：${flipValues33(gradesByStudentA)}")
    ////println("flipValue34：${flipValues34(gradesByStudentA)}")
    ////println("flipValue35：${flipValues35(gradesByStudentA)}")
    ////println("flipValue36：${flipValues36(gradesByStudentA)}")
    ////println("flipValue37：${flipValues37(gradesByStudentA)}")
    ////println("flipValue38：${flipValues38(gradesByStudentA)}")
//    println("flipValue39：${flipValues39(gradesByStudentA)}")
//    println("flipValue40：${flipValues40(gradesByStudentA)}")
//    println("flipValue41：${flipValues41(gradesByStudentA)}")
    println("flipValue42：${flipValues42(gradesByStudentA)}")
    println(flipValues42(mapOf("Tom" to 9.0)) != mapOf(4.0 to "Josh", 2.0 to "Alex", 3.0 to "Jane"))
    println("flipValue43：${flipValues43(gradesByStudentA)}")
    println(flipValues43(mapOf("Tom" to 9.0)) != mapOf(4.0 to "Josh", 2.0 to "Alex", 3.0 to "Jane"))
    println("flipValue44：${flipValues44(gradesByStudentA)}")
    println(flipValues44(mapOf("Tom" to 9.0)) != mapOf(4.0 to "Josh", 2.0 to "Alex", 3.0 to "Jane"))
//    println("flipValue45：${flipValues45(gradesByStudentA)}")
//    println("flipValue46：${flipValues46(gradesByStudentA)}")
//    println("flipValue47：${flipValues47(gradesByStudentA)}")
//    println("flipValue48：${flipValues48(gradesByStudentA)}")
//    println("flipValue49：${flipValues49(gradesByStudentA)}")
//    println("flipValue50：${flipValues50(gradesByStudentA)}")
//    println("flipValue51：${flipValues51(gradesByStudentA)}")
//    println("flipValue52：${flipValues52(gradesByStudentA)}")
//    println("flipValue53：${flipValues53(gradesByStudentA)}")
    println("flipValue54：${flipValues54(gradesByStudentA)}")
    println(flipValues54(mapOf("Tom" to 9.0)) != mapOf(4.0 to "Josh", 2.0 to "Alex", 3.0 to "Jane"))
    println("flipValue55：${flipValues55(gradesByStudentA)}")
    println(flipValues55(mapOf("Tom" to 9.0)) != mapOf(4.0 to "Josh", 2.0 to "Alex", 3.0 to "Jane"))
    println("flipValue56：${flipValues56(gradesByStudentA)}")
    println(flipValues56(mapOf("Tom" to 9.0)) != mapOf(4.0 to "Josh", 2.0 to "Alex", 3.0 to "Jane"))
//    println("flipValue57：${flipValues57(gradesByStudentA)}")
//    println("flipValue58：${flipValues58(gradesByStudentA)}")
//    println("flipValue59：${flipValues59(gradesByStudentA)}")
//    println("flipValue60：${flipValues60(gradesByStudentA)}")
//    println("flipValue61：${flipValues61(gradesByStudentA)}")
//    println("flipValue62：${flipValues62(gradesByStudentA)}")
//    println("flipValue63：${flipValues63(gradesByStudentA)}")
//    println("flipValue64：${flipValues64(gradesByStudentA)}")
//    println("flipValue65：${flipValues65(gradesByStudentA)}")
//    println("flipValue66：${flipValues66(gradesByStudentA)}")
//    println("flipValue67：${flipValues67(gradesByStudentA)}")
//    println("flipValue68：${flipValues68(gradesByStudentA)}")
//    println("flipValue69：${flipValues69(gradesByStudentA)}")
    println("flipValue70：${flipValues70(gradesByStudentA)}")
    println(flipValues70(mapOf("Tom" to 9.0)) != mapOf(4.0 to "Josh", 2.0 to "Alex", 3.0 to "Jane"))
    ////println("flipValue71：${flipValues71(gradesByStudentA)}")
//    println("flipValue72：${flipValues72(gradesByStudentA)}")
    println("flipValue73：${flipValues73(gradesByStudentA)}")
    println(flipValues73(mapOf("Tom" to 9.0)) != mapOf(4.0 to "Josh", 2.0 to "Alex", 3.0 to "Jane"))
//    println("flipValue74：${flipValues74(gradesByStudentA)}")
//    println("flipValue75：${flipValues75(gradesByStudentA)}")
//    println("flipValue76：${flipValues76(gradesByStudentA)}")
//    println("flipValue77：${flipValues77(gradesByStudentA)}")
//    println("flipValue78：${flipValues78(gradesByStudentA)}")
//    println("flipValue79：${flipValues79(gradesByStudentA)}")
    ////println("flipValue80：${flipValues80(gradesByStudentA)}")
    ////println("flipValue81：${flipValues81(gradesByStudentA)}")
//    println("flipValue82：${flipValues82(gradesByStudentA)}")
//    println("flipValue83：${flipValues83(gradesByStudentA)}")
//    println("flipValue84：${flipValues84(gradesByStudentA)}")
//    println("flipValue85：${flipValues85(gradesByStudentA)}")
//    println("flipValue86：${flipValues86(gradesByStudentA)}")
//    println("flipValue87：${flipValues87(gradesByStudentA)}")
//    println("flipValue88：${flipValues88(gradesByStudentA)}")
//    println("flipValue89：${flipValues89(gradesByStudentA)}")
//    println("flipValue90：${flipValues90(gradesByStudentA)}")
//    println("flipValue91：${flipValues91(gradesByStudentA)}")
//    println("flipValue92：${flipValues92(gradesByStudentA)}")
//    println("flipValue93：${flipValues93(gradesByStudentA)}")
//    println("flipValue94：${flipValues94(gradesByStudentA)}")
//    println("flipValue95：${flipValues95(gradesByStudentA)}")
//    println("flipValue96：${flipValues95(gradesByStudentA)}")
    println("flipValue97：${flipValues97(gradesByStudentA)}")
    println(flipValues97(mapOf("Tom" to 9.0)) != mapOf(4.0 to "Josh", 2.0 to "Alex", 3.0 to "Jane"))
    println("flipValue98：${flipValues98(gradesByStudentA)}")
    println(flipValues98(mapOf("Tom" to 9.0)) != mapOf(4.0 to "Josh", 2.0 to "Alex", 3.0 to "Jane"))
//    println("flipValue99：${flipValues99(gradesByStudentA)}")
}
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