回答編集履歴
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テキスト追加
test
CHANGED
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@@ -15,3 +15,35 @@
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```
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別案として、上記のような「いったんjoinしてからreplace」ではないやり方でやるとすれば、以下のようにreduceを使うとできます。
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```javascript
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const fruits = ["Banana", "Orange", "Apple", "Mango", "Banana", "Banana", "Orange", "Apple"];
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const energy = fruits.reduce((joinedFruits, fruit, i, ary) => {
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const delimiter = i > 0
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? (ary[i-1] === 'Banana' && fruit === 'Orange' ? '・' : ', ' )
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: '';
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return `${joinedFruits}${delimiter}${fruit}`;
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}, '');
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console.log(energy); // => "Banana・Orange, Apple, Mango, Banana, Banana・Orange, Apple"
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```
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