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javascript/snippets/coalesce.md

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+---
+title: Argument coalescing
+type: snippet
+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'); // ''
+```