https://github.com/johnpaulada/maybe

A simple, lightweight, Maybe implementation in JavaScript.
https://github.com/johnpaulada/maybe

functional-programming maybe monad

Last synced: 9 months ago
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A simple, lightweight, Maybe implementation in JavaScript.

• Host: GitHub
• URL: https://github.com/johnpaulada/maybe
• Owner: johnpaulada
• Created: 2017-08-21T07:11:37.000Z (about 8 years ago)
• Default Branch: master
• Last Pushed: 2018-07-07T13:51:27.000Z (over 7 years ago)
• Last Synced: 2025-02-13T09:45:36.835Z (9 months ago)
• Topics: functional-programming, maybe, monad
• Language: JavaScript
• Homepage:
• Size: 40 KB
• Stars: 0
• Watchers: 2
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
# Maybe

A simple Maybe implementation in JavaScript.

[![forthebadge](http://forthebadge.com/images/badges/fuck-it-ship-it.svg)](http://forthebadge.com)

[![forthebadge](http://forthebadge.com/images/badges/uses-js.svg)](http://forthebadge.com)

[![](https://data.jsdelivr.com/v1/package/npm/@johnpaulada/maybe/badge)](https://www.jsdelivr.com/package/npm/@johnpaulada/maybe)

## Getting Started

### Importing the library

To use the library, first import it:

In Node:

```javascript

const Maybe = require('@johnpaulada/maybe')

```

As ES Module:

```javascript

import Maybe from '@johnpaulada/maybe'

```

On the browser:

```html

```

### Using the library

To create a Maybe (Just/Nothing) use the `of()` method like this:

```javascript

const value = Maybe.of(1) // Just(1)

```

To work with the value, you can `map()` for example:

```javascript

const plusFive = value.map(x => x + 5) // Just(6)

```

To get the value outside of Maybe, use the `reduce()` method:

```javascript

const sixValue = plusFive.reduce(x => x) // 6

```

or the `value()` method:

```javascript

const sixValue = plusFive.value(0)

```

This will get the value of the Maybe if it's a `Just` and will return a 0 if it's a `Nothing`.

## Development

1. Install [Yarn](https://yarnpkg.com).

2. Install Rollup.

2. Run `yarn` on the terminal to install dependencies.

3. Running `rollup -c` will build the library.

## Roadmap

- [ ] Lazy Evaluation

- [ ] Example for `ap`

- [ ] Example for `branch`

## License

MIT