Inserts a value to an ordered array.<br>
> This is part of package [extra-array].

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

```javascript
array.insert$(x, v, [fn]);
// x:  an array (updated)
// v:  value to insert
// fn: compare function (a, b)
// --> x
```

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

var a = [1, 7, 8, 10];
array.insert$(a, 5);
// [1, 5, 7, 8, 10]

a;
// [1, 5, 7, 8, 10]

var b = ['a', 'K', 'M', 'n'];
array.insert$(b, 'l', (a, b) => a.toLowerCase().localeCompare(b.toLowerCase()));
// ['a', 'K', 'l', 'M', 'n'];

b;
// ['a', 'K', 'l', 'M', 'n'];
```

### references

- [Data.List.insert: Haskell](https://hackage.haskell.org/package/base-4.12.0.0/docs/Data-List.html#v:insert)