How to check for two events in node.js

Question

I'm looking to fire off a function, but only when two or multiple events have fired. Is there a built in way to do this?

Here's with one event:

setup.on('api routes ready', function () {
  console.log('Yay!');
});

How can I do this:

setup.on('api routes ready', 'website routes ready', function () {
  console.log('Yay!');
});

Any ideas would be rockin'!

Answer 1

Best done with a library such as async which has appropriate functions.

With that, you can choose whether to execute your functions in parallel or in series and if in parallel, then you can define a callback that will only run after all functions are complete.

Whilst @HeadCode's code will work, it doesn't scale well and is easy to make a mistake.

Answer 2

This is (an untested) start.

var waitForIt = (function(){
    var api_ready = false;
    var web_ready = false;
    return function(event){
        if (event === 'api routes ready'){
            api_ready = true;
        }
        if(event === 'web routes ready'){
            web_ready = true;
        }

        if(api_ready && web_ready){
            console.log('Yay!');
        }
    }
 })();

setup.on('api routes ready', function () {
    waitForIt('api routes ready');
});

setup.on('web routes ready', function () {
    waitForIt('web routes ready');
});