質問編集履歴
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@@ -16,34 +16,34 @@
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const updatedArray3 = ['b', 'd']; // 削除 & 追加
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const updatedArray4 = []; // 全削除
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let
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let addedElements1 = updatedArray1.filter(x => !initialArray.includes(x));
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let
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let addedElements2 = updatedArray2.filter(x => !initialArray.includes(x));
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let
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let addedElements3 = updatedArray3.filter(x => !initialArray.includes(x));
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let
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let addedElements4 = updatedArray4.filter(x => !initialArray.includes(x));
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console.log("----- added
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console.log("----- added elements -----");
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console.log(
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console.log(addedElements1);
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console.log(
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console.log(addedElements2);
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console.log(
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console.log(addedElements3);
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console.log(
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console.log(addedElements4);
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let
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let removedElements1 = initialArray.filter(x => !updatedArray1.includes(x));
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let
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let removedElements2 = initialArray.filter(x => !updatedArray2.includes(x));
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let
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let removedElements3 = initialArray.filter(x => !updatedArray3.includes(x));
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let
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let removedElements4 = initialArray.filter(x => !updatedArray4.includes(x));
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console.log("----- removed
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console.log("----- removed elements -----");
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console.log(
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console.log(removedElements1);
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console.log(
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console.log(removedElements2);
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console.log(
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console.log(removedElements3);
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console.log(
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console.log(removedElements4);
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```
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上記の実行結果です。
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```
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----- added
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----- added elements -----
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[]
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["d"]
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["d"]
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[]
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----- removed
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----- removed elements -----
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["b"]
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[]
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["a", "c"]
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