質問編集履歴
2
追記
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@@ -31,4 +31,7 @@
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```
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[['a', 'b']]
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[ 'a' ]
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```
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```
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###### 参考文献
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https://qiita.com/cocottejs/items/7afe6d5f27ee7c36c61f
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1
変数名の最適化
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@@ -9,16 +9,16 @@
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var arr1 = [['a', 'b'], ['a', 'c'], ['a', 'b'], ['c', 'a']];
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var arr2 = ['a', 'b', 'c', 'a'];
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var
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var dup1 = arr1.filter((x, i, self) => {
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return self.indexOf(x) === i && i !== self.lastIndexOf(x);
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});
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var
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var dup2 = arr2.filter((x, i, self) => {
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return self.indexOf(x) === i && i !== self.lastIndexOf(x);
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});
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console.log(
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console.log(dup1);
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console.log(
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console.log(dup2);
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```
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#### 結果
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