回答編集履歴
1
String 型への変換処理を追加
answer
CHANGED
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@@ -4,7 +4,7 @@
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4
4
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5
5
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```JavaScript
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6
6
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function calc (arithmeticOperator) {
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7
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-
switch (arithmeticOperator) {
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7
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+
switch (String(arithmeticOperator)) {
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8
8
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case '+':
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9
9
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return 3 + 5;
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10
10
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case '-':
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