Passing a pointer/reference to a variable as parameter

Question

I know this question has been asked multiple times (yes, I did some research) but I can\'t see to find a solution that fits my needs.

What I have done so far:

Answer 1

Try the following example :

'use strict';

var observable = 0;

function incObservable() {
	++observable;
	console.log('incObservable observable: '+observable);
}
function observe() {
	console.log('observe observable: '+observable);
}

var observer = setInterval(observe, 100);

setTimeout(function() {
	incObservable();
	setTimeout(function() {
		incObservable();
		setTimeout(function() {
			incObservable();
		}, 300);
	}, 300);
}, 300);

setTimeout(function() {
	// Stop obsever
	clearInterval(observer);
}, 1000);

// observe observable: 0
// observe observable: 0
// incObservable observable: 1
// observe observable: 1
// observe observable: 1
// observe observable: 1
// incObservable observable: 2
// observe observable: 2
// observe observable: 2
// observe observable: 2
// incObservable observable: 3
// observe observable: 3