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javascript/snippets/coalesce-factory.md

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+---
+title: Argument coalescing factory
+type: snippet
+tags: [function,type]
+cover: coffee-phone-tray
+dateModified: 2020-10-22T20:23:47+03:00
+---
+
+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, `valid`.
+
+```js
+const coalesceFactory = valid => (...args) => args.find(valid);
+```
+
+```js
+const customCoalesce = coalesceFactory(
+  v => ![null, undefined, '', NaN].includes(v)
+);
+customCoalesce(undefined, null, NaN, '', 'Waldo'); // 'Waldo'
+```