tmdesigned

function EventBus() {
    const eventCallbacksPairs = [];
    
    this.subscribe = function( eventType, callback ) {
        const eventCallbacksPair = findEventCallbacksPair(eventType);

        if(eventCallbacksPair)
            eventCallbacksPair.callbacks.push(callback);
        else
            eventCallbacksPairs.push( new EventCallbacksPair(eventType, callback) );