| 1 | Checks if array has a subsequence. [:running:] [:vhs:] [:package:] [:moon:] [:ledger:]
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| 2 | > Similar: [subsequence], [subsequences], [isSubsequence], [searchSubsequence].<br>
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| 3 | > Similar: [isValue], [isPrefix], [isInfix], [isSuffix], [isSubsequence], [isPermutation].<br>
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| 4 | > This is part of package [extra-array].
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| 5 |
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| 6 | [extra-array]: https://www.npmjs.com/package/extra-array
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| 7 |
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| 8 | ```javascript
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| 9 | array.isSubsequence(x, y, [fc], [fm]);
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| 10 | // x: an array
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| 11 | // y: subsequence?
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| 12 | // fc: compare function (a, b)
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| 13 | // fm: map function (v, i, x)
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| 14 | ```
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| 15 |
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| 16 | ```javascript
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| 17 | const array = require('extra-array');
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| 18 |
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| 19 | var x = [1, 2, 3, 4];
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| 20 | array.isSubsequence(x, [2, 4]);
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| 21 | // true
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| 22 |
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| 23 | array.isSubsequence(x, [-2, -4]);
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| 24 | // false
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| 25 |
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| 26 | array.isSubsequence(x, [-2, -4], (a, b) => Math.abs(a) - Math.abs(b));
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| 27 | // true
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| 28 |
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| 29 | array.isSubsequence(x, [-2, -4], null, v => Math.abs(v));
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| 30 | // true
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| 31 | ```
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| 32 |
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| 33 | ### references
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| 34 |
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| 35 | - [Data.List.isSubsequenceOf: Haskell](https://hackage.haskell.org/package/base-4.12.0.0/docs/Data-List.html#v:isSubsequenceOf)
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| 36 | - [List-Extra.isSubsequenceOf: elm](https://package.elm-lang.org/packages/elm-community/list-extra/7.1.0/List-Extra#isSubsequenceOf)
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| 37 |
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| 38 | [:running:]: https://npm.runkit.com/@extra-array/is-subsequence
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| 39 | [:package:]: https://www.npmjs.com/package/@extra-array/is-subsequence
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| 40 | [:moon:]: https://www.npmjs.com/package/@extra-array/is-subsequence.min
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| 41 | [subsequence]: https://github.com/nodef/extra-array/wiki/subsequence
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| 42 | [subsequences]: https://github.com/nodef/extra-array/wiki/subsequences
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| 43 | [isSubsequence]: https://github.com/nodef/extra-array/wiki/isSubsequence
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| 44 | [:ledger:]: https://unpkg.com/@extra-array/is-subsequence/
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| 45 | [:vhs:]: https://asciinema.org/a/332082
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| 46 | [searchSubsequence]: https://github.com/nodef/extra-array/wiki/searchSubsequence
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| 47 | [isValue]: https://github.com/nodef/extra-array/wiki/isValue
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| 48 | [isPrefix]: https://github.com/nodef/extra-array/wiki/isPrefix
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| 49 | [isInfix]: https://github.com/nodef/extra-array/wiki/isInfix
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| 50 | [isSuffix]: https://github.com/nodef/extra-array/wiki/isSuffix
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| 51 | [isPermutation]: https://github.com/nodef/extra-array/wiki/isPermutation
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