Pub Sub Pattern

pubsub.js

class PubSub {
    constructor() {
        this.events = []
    }

    on(name, handler) {
        this.events[name] = this.events[name] || []
        this.events[name].push(handler)
    }

    off(name, handler) {
        if (this.events[name]) {
            let handlerIndex = this.events[name].findIndex(h => h === handler)

            if (handlerIndex >= 0) {
                this.events[name].splice(handlerIndex, 1)
            }
        }
    }

    emit(name, data) {
        if (this.events[name]) {
            this.events[name].forEach(h => h(data))
        }
    }
}

export const PUBSUB = new PubSub()