回答編集履歴
1
ゼロに対応
test
CHANGED
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@@ -1,6 +1,6 @@
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1
1
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```js
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2
2
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3
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-
console.log( ['cat', '', 'dog'].filter( v => !!v ).length );
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3
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+
console.log( ['cat', '', 'dog', 0 ].filter( v => !!( '' + v ) ).length ); // 3
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4
4
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5
5
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```
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6
6
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