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Update snippet descriptions & tags

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Isabelle Viktoria Maciohsek
2020-10-18 23:04:45 +03:00
parent 216c3ac77a
commit 2b6f2b1740
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snippets/coalesceFactory.md
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---
title: coalesceFactory
tags: type,intermediate
tags: function,type,intermediate
---
Returns a customized coalesce function that returns the first argument that returns `true` from the provided argument validation function.
Customizes a coalesce function that returns the first argument which is true based on the given validator.
- Use `Array.prototype.find()` to return the first argument that returns `true` from the provided argument validation function.
- Use `Array.prototype.find()` to return the first argument that returns `true` from the provided argument validation function, `valid`.
```js
const coalesceFactory = valid => (...args) => args.find(valid);
```
```js
const customCoalesce = coalesceFactory(_ => ![null, undefined, '', NaN].includes(_));
customCoalesce(undefined, null, NaN, '', 'Waldo'); // "Waldo"
const customCoalesce = coalesceFactory(v => ![null, undefined, '', NaN].includes(v));
customCoalesce(undefined, null, NaN, '', 'Waldo'); // 'Waldo'
```