Strongly Typed Events - Simple events

Simple events are a type of event that will provide an argument with data when fired. If you use typescript, you can leverage the support for generics and get strongly typed code.

Need a different type of event? Check out the others.

Subscription made easy

An example says more than a 1000 words. Imagine if you have events like this on your class:

1let clock = new Clock("Smu", 1000);
2
3//log the name of the clock and the tick argument to the console - this is an event
4clock.onClockTick.subscribe((c, n) =>
5  console.log(`${c.name} ticked ${n} times.`)
6);

Events made easy

So let's look at the implementation from a TypeScript perspective. (Do you program NodeJs without typescript? Check this)

1import { SimpleEventDispatcher } from "ste-simple-events";
2
3class Clock {
4  private _onSequenceTick = new SimpleEventDispatcher<number>();
5  private _ticks: number = 0;
6
7  constructor(public name: string, timeout: number) {
8    setInterval(() => {
9      this._ticks += 1;
10      this._onSequenceTick.dispatch(this._ticks);
11    }, timeout);
12  }
13
14  public get onSequenceTick() {
15    return this._onSequenceTick.asEvent();
16  }
17}

Check the documentation or the examples for more information.

Need more info? Check the repo.

Maintenance

This project is maintained by Kees C. Bakker.