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snippets/js/s/nth-arg.md

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+---
+title: Nth argument
+type: snippet
+language: javascript
+tags: [function]
+cover: mug-flower-book
+dateModified: 2020-10-21T21:54:53+03:00
+---
+
+Creates a function that gets the argument at index `n`.
+
+- Use `Array.prototype.slice()` to get the desired argument at index `n`.
+- If `n` is negative, the nth argument from the end is returned.
+
+```js
+const nthArg = n => (...args) => args.slice(n)[0];
+```
+
+```js
+const third = nthArg(2);
+third(1, 2, 3); // 3
+third(1, 2); // undefined
+const last = nthArg(-1);
+last(1, 2, 3, 4, 5); // 5
+```