@extra-array/is-subsequence/README.md

Checks if array has a subsequence.

Checks if array has a subsequence. [:running:] [:vhs:] [:package:] [:moon:] [:ledger:]
> Similar: [subsequence], [subsequences], [isSubsequence], [searchSubsequence].<br>
> Similar: [isValue], [isPrefix], [isInfix], [isSuffix], [isSubsequence], [isPermutation].<br>
> This is part of package [extra-array].

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

```javascript
array.isSubsequence(x, y, [fc], [fm]);
// x:  an array
// y:  subsequence?
// fc: compare function (a, b)
// fm: map function (v, i, x)
```

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

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

array.isSubsequence(x, [-2, -4]);
// false

array.isSubsequence(x, [-2, -4], (a, b) => Math.abs(a) - Math.abs(b));
// true

array.isSubsequence(x, [-2, -4], null, v => Math.abs(v));
// true
```

### references

- [Data.List.isSubsequenceOf: Haskell](https://hackage.haskell.org/package/base-4.12.0.0/docs/Data-List.html#v:isSubsequenceOf)
- [List-Extra.isSubsequenceOf: elm](https://package.elm-lang.org/packages/elm-community/list-extra/7.1.0/List-Extra#isSubsequenceOf)

[:running:]: https://npm.runkit.com/@extra-array/is-subsequence
[:package:]: https://www.npmjs.com/package/@extra-array/is-subsequence
[:moon:]: https://www.npmjs.com/package/@extra-array/is-subsequence.min
[subsequence]: https://github.com/nodef/extra-array/wiki/subsequence
[subsequences]: https://github.com/nodef/extra-array/wiki/subsequences
[isSubsequence]: https://github.com/nodef/extra-array/wiki/isSubsequence
[:ledger:]: https://unpkg.com/@extra-array/is-subsequence/
[:vhs:]: https://asciinema.org/a/332082
[searchSubsequence]: https://github.com/nodef/extra-array/wiki/searchSubsequence
[isValue]: https://github.com/nodef/extra-array/wiki/isValue
[isPrefix]: https://github.com/nodef/extra-array/wiki/isPrefix
[isInfix]: https://github.com/nodef/extra-array/wiki/isInfix
[isSuffix]: https://github.com/nodef/extra-array/wiki/isSuffix
[isPermutation]: https://github.com/nodef/extra-array/wiki/isPermutation