mini-signals

mini-signals

signals, in JavaScript, fast

Description

Custom event/messaging system for JavaScript inspired by js-signals originally based on EventEmitter3 code base.

There are several advantages to signals over event-emitters (see Comparison between different Observer Pattern implementations). However, the current implementation of js-signals is (arguably) slow compared to other implementations (see EventsSpeedTests). mini-signals is a fast, minimal emitter, with an API similar to js-signals.

Install

npm:

npm install mini-signals

jspm:

jspm install mini-signals=github:Hypercubed/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 Signal = require('mini-signals');

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');
}

License

Copyright (c) 2015 Jayson Harshbarger

MIT License