@extra-array/map-update/README.md

Updates values based on map function.

Updates values based on map function.
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> Alternatives: [map], [map$].<br>
> Similar: [map], [filter], [reject], [reduce], [accumulate].

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

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

<br>

```javascript
array.map$(x, fm);
// x:  an array (updated)
// fm: map function (v, i, x)
// → x
```

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

var x = [1, 2, 3, 4];
array.map$(x, v => v * 2);
// [ 2, 4, 6, 8 ]

x;
// [ 2, 4, 6, 8 ]
```

<br>
<br>


## References

- [Data.List.map: Haskell](https://hackage.haskell.org/package/base-4.12.0.0/docs/Data-List.html#v:map)
- [Array.prototype.map: MDN web docs](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map)
- [array_map: PHP](https://www.php.net/manual/en/function.array-map.php)

[map]: https://github.com/nodef/extra-array/wiki/map
[map$]: https://github.com/nodef/extra-array/wiki/map$
[filter]: https://github.com/nodef/extra-array/wiki/filter
[reduce]: https://github.com/nodef/extra-array/wiki/reduce
[accumulate]: https://github.com/nodef/extra-array/wiki/accumulate
[reject]: https://github.com/nodef/extra-array/wiki/reject