26 lines
536 B
Markdown
26 lines
536 B
Markdown
---
|
|
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
|
|
```
|