22 lines
579 B
Markdown
22 lines
579 B
Markdown
---
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title: Compact and join array
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tags: array
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expertise: intermediate
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author: chalarangelo
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cover: blog_images/racoon.jpg
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firstSeen: 2022-04-08T05:00:00-04:00
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---
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Removes falsy values from an array and combines the remaining values into a string.
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- Use `Array.prototype.filter()` to filter out falsy values (`false`, `null`, `0`, `""`, `undefined`, and `NaN`).
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- Use `Array.prototype.join()` to join the remaining values into a string.
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```js
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const compactJoin = (arr, delim = ',') => arr.filter(Boolean).join(delim);
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```
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```js
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compactJoin(['a', '', 'b', 'c']); // 'a,b,c'
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```
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