Appends values from arrays.
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> Alternatives: [concat], [concat$].<br>
> Similar: [concat], [join].

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

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

<br>

```javascript
array.concat$(x, ...ys);
// x:  an array (updated)
// ys: arrays to append
// → x
```

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

var x = [1, 2];
var y = [3, 4];
array.concat$(x, y);
// [ 1, 2, 3, 4 ]

x;
// [ 1, 2, 3, 4 ]

var x = [1, 2];
array.concat$(x, y, y);
// [ 1, 2, 3, 4, 3, 4 ]
```

<br>
<br>


## References

- [Array.prototype.concat: MDN web docs](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/concat)
- [_.concat: lodash](https://lodash.com/docs/4.17.15#concat)
- [Array.append: sugarjs](https://sugarjs.com/docs/#/Array/append)

[concat]: https://github.com/nodef/extra-array/wiki/concat
[concat$]: https://github.com/nodef/extra-array/wiki/concat$
[join]: https://github.com/nodef/extra-array/wiki/join