# mini-signals
signals, in JavaScript, fast

[![NPM](https://img.shields.io/npm/v/mini-signals.svg)](https://www.npmjs.com/package/mini-signals) [![Build Status](https://travis-ci.org/Hypercubed/mini-signals.svg)](https://travis-ci.org/Hypercubed/mini-signals/) [![Codacy Badge](https://api.codacy.com/project/badge/18fa3fdfb90b43c7966f817124307d66)](https://www.codacy.com/app/hypercubed/mini-signals) [![License](https://img.shields.io/badge/license-MIT-blue.svg)](https://github.com/Hypercubed/mini-signals/blob/master/LICENSE)

## Description

Custom event/messaging system for JavaScript inspired by [js-signals](https://github.com/millermedeiros/js-signals) originally based on [EventEmitter3](https://github.com/primus/eventemitter3) code base.

There are several advantages to signals over event-emitters (see [Comparison between different Observer Pattern implementations](https://github.com/millermedeiros/js-signals/wiki/Comparison-between-different-Observer-Pattern-implementations)).  However, the current implementation of [js-signals](https://github.com/millermedeiros/js-signals) is (arguably) slow compared to other implementations (see [EventsSpeedTests](https://github.com/Hypercubed/EventsSpeedTests)).  `mini-signals` is a fast, minimal emitter, with an API similar to [js-signals](https://github.com/millermedeiros/js-signals).

## Install

### npm:

```
npm install mini-signals
```

### jspm:

```
jspm install mini-signals=npm:mini-signals
```

### bower:

```
bower install mini-signals
```

## Example Usage

***When not using a module loader the mini-signals constructor (`MiniSignal`) is global.***

```
var MiniSignal = require('mini-signals');
var mySignal = new MiniSignal();

var binding = mySignal.add(onSignal);   //add listener
mySignal.dispatch('foo', 'bar');        //dispatch signal passing custom parameters
binding.detach();                       //remove a single listener

function onSignal(foo, bar) {
  assert(foo === 'foo');
  assert(bar === 'bar');
}
```

## Another Example

```
var myObject = {
  foo: 'bar',
  updated: new MiniSignal()
}

myObject.updated.add(onUpdated,myObject);   //add listener with context

myObject.foo = 'baz';
myObject.updated.dispatch();                 //dispatch signal

function onUpdated() {
  assert(this === myObject);
  assert(this.foo === 'baz');
}
```

## API

See [API.md](https://github.com/Hypercubed/mini-signals/blob/master/API.md)

## License

Copyright (c) 2015 Jayson Harshbarger

MIT License