Unusual Event-Emitter

This emitter has been written for a single specific purpose - make it easy to unsibscribe at any given moment in any place of your code. Each subscribtion returns string subscribtion identifier. No need to save each callback function as a variable just to be able to remove one exact listener later.

Why?

For simplicity.

Nothing but ES6 Class. Feel free to extend from it.

Except for one little detail: The main feature is event-id for each event.

const UEE = require('./index')

const ev = new UEE()

const event_id = ev.on('pew', (params) => { console.log('ouch!') })

// somewhere else in the universe
// you want to unsubscribe from this specific event
ev.off(event_id)

That's it. Nothing to look at... :3

Oh, wait! Maybe also this... .emit() returns number of fired events:

ev.on('beep', () => { console.log('beep here!') })
ev.on('beep', () => { console.log('and beep there!') })

const howMuch = ev.emit('beep')

console.log('beeped:', howMuch, 'times') // beeped: 2 times

const whosThere = ev.listeners('beep') 
console.log(whosThere) // also output: 2

Nah... nevermind. Forget about it.

ev.wipe_emitter()

NOTE:

• No tests.
• No dependencies.
• No mind-blowing features.
• No babel/ts/or-whatever.

Future

• Remove events by .startWith or regexp.
• Maybe some performance micro-optimizations will come later.
• I will use it.