@extra-array/unique

Removes duplicate values.
:package:
:smiley_cat:
:running:
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:moon:
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> Alternatives: [unique], [isUnique].

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

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

``javascript
array.unique(x, [fc], [fm]);
// x: an array
// fc: compare function (a, b)
// fm: map function (v, i, x)
`
> :stopwatch: Compare function => O(n²).

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

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

var x = [1, 2, 3, 4, -2, -3];
array.unique(x, (a, b) => Math.abs(a) - Math.abs(b));
// [ 1, 2, 3, 4 ]

array.unique(x, null, v => Math.abs(v));
// [ 1, 2, 3, 4 ]
``

References

- Data.List.nub: Haskell
- List-Extra.unique: elm
- List-Extra.uniqueBy: elm
- _.uniq: lodash
- _.uniqBy: lodash
- _.uniqWith: lodash
- Array.unique: sugarjs

[unique]: https://github.com/nodef/extra-array/wiki/unique
[isUnique]: https://github.com/nodef/extra-array/wiki/isUnique