回答編集履歴
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調整
answer
CHANGED
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@@ -1,6 +1,10 @@
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1
1
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```javascript
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2
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-
const str= "1212121,
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2
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+
const str= "3434,1212121,43434,56757,7878787"
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3
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-
const
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3
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+
const check1=(keyword,str)=>RegExp(`(^|,)${keyword}(?=,|$)`).test(str);//正規表現
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4
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+
const check2=(keyword,str)=>str.split(",").includes(keyword);//配列
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4
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-
console.log(
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5
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console.log(check1("343434",str));
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5
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-
console.log(
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6
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+
console.log(check1("3434",str));
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7
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console.log(check2("343434",str));
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8
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+
console.log(check2("3434",str));
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9
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+
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6
10
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```
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