回答編集履歴
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ゼロに対応
answer
CHANGED
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@@ -1,5 +1,5 @@
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```js
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-
console.log( ['cat', '', 'dog'].filter( v => !!v ).length );
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console.log( ['cat', '', 'dog', 0 ].filter( v => !!( '' + v ) ).length ); // 3
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```
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【Array.prototype.filter() - JavaScript | MDN】
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