# @provably-fair/shuffle

Array shuffling functionality for provably fair games.

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## API Reference

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### shuffle

Shuffles an array based on the given seeds, using the given HMAC algorithm.

**Parameters**

-   `arr` **\[]** Array to be shuffled.
-   `hmacAlgorithm` **[string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String)** Algorithm used for computing the HMAC of the given seed pair.
-   `secretSeed` **([string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String) \| [Buffer](https://nodejs.org/api/buffer.html))** Secret seed used as HMAC key.
-   `publicSeed` **([string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String) \| [Buffer](https://nodejs.org/api/buffer.html))?** Public seed used as HMAC data. To prove fairness of random
    outputs, the hash of `secretSeed` shall be known before revealing `publicSeed`.
-   `hmacBufferUIntParser` **[function](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/function)?** Function to be used for parsing a UInt from the
    generated HMAC buffer.
-   `fallbackProvider` **[function](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/function)?** Function to provide a fallback value in a given range
    whether no appropriate number can be parsed from the generated HMAC buffer.

Returns **\[]** A new array instance containing every element of the input.