rhaj/_archive/rhai_engine/rhaibook/lib/rhai-rand.md

rhai-rand: Random Number Generation, Shuffling and Sampling

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rhai-rand is an independent Rhai [package] that provides:

• random number generation using the rand crate
• [array] shuffling and sampling

See [https://docs.rs/rhai-rand](https://docs.rs/rhai-rand#api) for the list of functions.

On crates.io: rhai-rand

On GitHub: rhaiscript/rhai-rand

Package name: RandomPackage

Dependency

Cargo.toml:

[dependencies]
rhai = "{{version}}"
rhai-rand = "0.1"       # use rhai-rand crate

Load Package into [Engine]

use rhai::Engine;
use rhai::packages::Package;    // needed for 'Package' trait
use rhai_rand::RandomPackage;

let mut engine = Engine::new();

// Create new 'RandomPackage' instance
let random = RandomPackage::new();

// Load the package into the `Engine`
random.register_into_engine(&mut engine);

Features

Feature	Description	Default?	Should not be used with Rhai feature
float	enables random floating-point number generation	yes	[no_float]
array	enables methods for [arrays]	yes	[no_index]
metadata	enables [functions metadata] (turns on [metadata] in Rhai)	no

`Cargo.toml`:

```toml
[dependencies]
# Rhai is set for 'no_float', meaning no floating-point support
rhai = { version="{{version}}", features = ["no_float"] }

# Use 'default-features = false' to clear defaults, then only add 'array'
rhai-rand = { version="0.1", default-features = false, features = ["array"] }
```