21 lines
479 B
Markdown
21 lines
479 B
Markdown
---
|
|
title: Argument coalescing
|
|
type: snippet
|
|
language: javascript
|
|
tags: [type]
|
|
cover: flower-portrait-1
|
|
dateModified: 2020-09-15T16:28:04+03:00
|
|
---
|
|
|
|
Returns the first defined, non-null argument.
|
|
|
|
- Use `Array.prototype.find()` and `Array.prototype.includes()` to find the first value that is not equal to `undefined` or `null`.
|
|
|
|
```js
|
|
const coalesce = (...args) => args.find(v => ![undefined, null].includes(v));
|
|
```
|
|
|
|
```js
|
|
coalesce(null, undefined, '', NaN, 'Waldo'); // ''
|
|
```
|