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javascript/snippets/head.md

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+---
+title: Head of array
+type: snippet
+tags: [array]
+cover: clay-pot-horizon
+dateModified: 2020-10-19T22:49:51+03:00
+---
+
+Returns the head of an array.
+
+- Check if `arr` is truthy and has a `length` property.
+- Use `arr[0]` if possible to return the first element, otherwise return `undefined`.
+
+```js
+const head = arr => (arr && arr.length ? arr[0] : undefined);
+```
+
+```js
+head([1, 2, 3]); // 1
+head([]); // undefined
+head(null); // undefined
+head(undefined); // undefined
+```