Gets zero-based index.
[:package:](https://www.npmjs.com/package/@extra-array/index)
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[:moon:](https://www.npmjs.com/package/@extra-array/index.min)
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> Similar: [index], [indexRange], [size], [isEmpty].

> This is part of package [extra-array].

[extra-array]: https://www.npmjs.com/package/extra-array

<br>

```javascript
array.index(x, [i]);
// x: an array
// i: index (-ve: from right) (0)
```

```javascript
const array = require("extra-array");

var x = [2, 4, 6, 8];
array.index(x, 1);
// 1

array.index(x, -1);
// 3

array.index(x, -10);
// 0
```

<br>
<br>


## References

- [Array.prototype.slice: MDN web docs](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/slice)

[index]: https://github.com/nodef/extra-array/wiki/index
[indexRange]: https://github.com/nodef/extra-array/wiki/indexRange
[size]: https://github.com/nodef/extra-array/wiki/size
[isEmpty]: https://github.com/nodef/extra-array/wiki/isEmpty