20 lines
478 B
Markdown
20 lines
478 B
Markdown
---
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title: Argument coalescing
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tags: type
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cover: flower-portrait-1
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firstSeen: 2017-12-17T10:08:55+02:00
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lastUpdated: 2020-09-15T16:28:04+03:00
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---
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Returns the first defined, non-null argument.
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- Use `Array.prototype.find()` and `Array.prototype.includes()` to find the first value that is not equal to `undefined` or `null`.
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```js
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const coalesce = (...args) => args.find(v => ![undefined, null].includes(v));
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```
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```js
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coalesce(null, undefined, '', NaN, 'Waldo'); // ''
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```
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