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use function in coalesce factory

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xaveyaguarez
2017-12-17 14:09:04 -08:00
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snippets/coalesce-factory.md
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### Coalesce factory
Returns a function which provides a customized coalesce function
Returns a customized coalesce function that returns the first argument
that returns true from the provided argument validation function.
```js
const coalesceFactory = (excludes = [null, undefined]) => (...args) => args.find(_ => !excludes.includes(_))
// const customCoalesce = coalesceFactory([null, undefined, "", NaN])
// customCoalesce(undefined, null, NaN, "", "Waldo") -> "Waldo"
const coalesceFactory = valid => (...args) => args.find(valid)
// const customCoalesce = coalesceFactory(_ => ![null, undefined, "", NaN].includes(_))
// customCoalesce(undefined, null, NaN, "", "Waldo") //-> "Waldo"
```