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javascript/snippets/compact-join.md

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