@rimbu/hashed/README.md

Immutable HashMap and HashSet implementations for TypeScript

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# @rimbu/hashed

Welcome to `@rimbu/hashed`! This package provides robust implementations for `HashMap` and `HashSet`, forming the backbone of all Rimbu Hashed collections. These collections use a configurable `Hasher` instance to determine the equality of values/objects, ensuring efficient and reliable data management.

### Key Features:

- **Configurable Hashing**: Use a `Hasher` instance to customize how keys and values are hashed.
- **Efficient Lookups**: Optimized for fast retrieval and manipulation of data.
- **Versatile Collections**: Suitable for a wide range of applications requiring hashed data structures.

### Exported Types:

| Name            | Description                                                                                   |
| --------------- | --------------------------------------------------------------------------------------------- |
| `HashMap<K, V>` | A map with entries of key type `K` and value type `V`, where keys are hashed with a `Hasher`. |
| `HashSet<T>`    | A set of value type `T` where items are hashed with a `Hasher`.                               |

### Documentation

For complete documentation, please visit the [Map](https://rimbu.org/docs/collections/map) or [Set](https://rimbu.org/docs/collections/set) pages in the [Rimbu Docs](https://rimbu.org), or directly explore the [Rimbu Hashed API Docs](https://rimbu.org/api/rimbu/hashed).

### Try It Out

Experience `@rimbu/hashed` in action! [Try Out Rimbu](https://codesandbox.io/s/github/vitoke/rimbu-sandbox/tree/main?previewwindow=console&view=split&editorsize=65&moduleview=1&module=/src/index.ts) on CodeSandBox.

## Installation

### Compabitity

- [`Node` ![NodeJS](https://img.shields.io/badge/node.js-6DA55F?logo=node.js&logoColor=white)](https://nodejs.org)
- [`Deno` ![Deno JS](https://img.shields.io/badge/deno%20js-000000?logo=deno&logoColor=white)](https://deno.com/runtime)
- [`Bun` ![Bun](https://img.shields.io/badge/Bun-%23000000.svg?logoColor=white)](https://bun.sh/)
- `Web` ![HTML5](https://img.shields.io/badge/html5-%23E34F26.svg?logoColor=white)

### Package Managers

**Yarn:**

```sh
yarn add @rimbu/hashed
```

**npm:**

```sh
npm install @rimbu/hashed
```

**Bun:**

```sh
bun add @rimbu/hashed
```

### Deno Setup

Create or edit `import_map.json` in your project root:

```json
{
  "imports": {
    "@rimbu/": "https://deno.land/x/rimbu@x.y.z/"
  }
}
```

_Replace `x.y.z` with the desired version._

In this way you can use relative imports from Rimbu in your code, like so:

```ts
import { List } from '@rimbu/core/mod.ts';
import { HashMap } from '@rimbu/hashed/mod.ts';
```

Note that for sub-packages, due to conversion limitations it is needed to import the `index.ts` instead of `mod.ts`, like so:

```ts
import { HashMap } from '@rimbu/hashed/map/index.ts';
```

To run your script (let's assume the entry point is in `src/main.ts`):

`deno run --import-map import_map.json src/main.ts`

## Usage

```ts
import { HashSet } from '@rimbu/hashed';

console.log(HashSet.of(1, 3, 2, 4, 3, 1).toString());
```

## Author

Created and maintained by [Arvid Nicolaas](https://github.com/vitoke).

## Contributing

We welcome contributions! Please read our [Contributing guide](https://github.com/rimbu-org/rimbu/blob/main/CONTRIBUTING.md).

## Contributors

<img src = "https://contrib.rocks/image?repo=rimbu-org/rimbu"/>

_Made with [contributors-img](https://contrib.rocks)._

## License

This project is licensed under the MIT License. See the [LICENSE](./LICENSE) for details.