回答編集履歴
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テキスト追加
answer
CHANGED
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@@ -1,5 +1,22 @@
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1
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たとえば、こんなので。
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2
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```javascript
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3
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var numbers = [...Array(100)].map((_ ,i) => i);
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4
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5
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var x = 5;
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3
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-
numbers.filter(n => `${n}`.includes(
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var numbersHavingX = numbers.filter(n => `${n}`.includes(`${x}`));
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console.log(numbersHavingX); // => [5,15,25,35,45,50,51,52,53,54,55,56,57,58,59,65,75,85,95]
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9
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console.log(numbersHavingX.length); // => 19
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10
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11
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```
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5
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-
???? [サンプル](https://codepen.io/kilesa/pen/
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12
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???? [サンプル](https://codepen.io/kilesa/pen/ZEXBVJv?editors=0012)
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14
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15
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正規表現を使うのであれば
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17
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```javascript
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18
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var x = 5;
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19
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var pattern = RegExp(`${x}`);
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20
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var numbersHavingX = numbers.filter(n => pattern.test(`${n}`));
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21
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```
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22
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???? [サンプル](https://codepen.io/kilesa/pen/GRMNPOg?editors=0012)
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