# Randomly

A utility for generating lots of random numbers without being too tasking on the browser. Randomly accomplishes this by generating a set of random numbers on a given interval.

Subsequent requests for random numbers are served from the generated set instead of calling `Math.random`. In addition to getting random numbers, some useful methods have also been added around random numbers.

### Motivation

Working on several generative art projects inspired the need for a common utility which would handle very frequent calls to `Math.random` as well as other provided methods which involve using random numbers.

### Benchmarks

Why not just use `Math.random`? Depending on how many numbers are being generated `Randomly` tends to be more performant as frequency increases. The following chart shows their comparison. You can view how this was measured in the [benchmark.ts](https://github.com/ededejr/randomly/blob/main/scripts/bin/benchmark.ts) file.

<img src="https://raw.githubusercontent.com/ededejr/randomly/main/benchmark-chart.svg" />

## Usage

```ts
import Randomly from '@ededejr/randomly';

const randomly = new Randomly();
```

#### Getting a random number

```ts
randomly.get(); // Returns a number between 0 and 1
```

#### Compare a random number using a predicate

```ts
randomly.compare((value) => Math.floor(value * 1000) > 500);
```

#### Check if a random number is less than a threshold

```ts
randomly.lt(0.2);
```

#### Check if a random number is greater than a threshold

```ts
randomly.gt(0.2);
```

#### Check if a random number is between an upper and lower bound

```ts
randomly.between(0.2, 0.6);
```

#### Decide between two values

```ts
randomly.decide('Option A', 'Option B');
```

#### Get a Radom number between 0 and a given value

```ts
randomly.sample(100);
```

#### Controlling the timer

If you would like to pause the interval:

```ts
randomly.stopTimer();
```

Starting it up again:

```ts
randomly.startTimer();
```

#### Customizing the interval or store size

```ts
import Randomly from '@ededejr/randomly';

const randomly = new Randomly({
	refreshInterval: 5000, // refresh random number store every 5 seconds
	storeSize: 100, // keep a store of a 100 random numbers
});
```