event emitter

Node.js

const EventEmitter = require('events')
class MyEmitter extends EventEmitter {}
const myEmitter = new MyEmitter()
myEmitter.on('my-event', msg => {
  console.log(msg)
})
myEmitter.on('my-other-event', msg => {
  console.log(msg)
})
myEmitter.emit('my-event', 'hello world')
myEmitter.emit('my-other-event', 'hello other world')

Output

hello world
hello other world

Go

(closest thing is to use channels)

package main
import (
    "fmt"
)
type MyEmitter map[string]chan string
func main() {
    myEmitter := MyEmitter{}
    myEmitter["my-event"] = make(chan string)
    myEmitter["my-other-event"] = make(chan string)
    go func() {
        for {
            select {
            case msg := <-myEmitter["my-event"]:
                fmt.Println(msg)
            case msg := <-myEmitter["my-other-event"]:
                fmt.Println(msg)
            }
        }
    }()
    myEmitter["my-event"] <- "hello world"
    myEmitter["my-other-event"] <- "hello other world"
}

Output

hello world
hello other world