Hey everybody ☺
I have a problem with calling functions in javascript for my dApp and hope someone of you can help me out...

I have those two functions:

function a (){
var myArray = [];
// for loop which fills up the array
return myArray;
}

function b (){
var dummy = a();
var lengthOfDummy = dummy.length;
console.log(dummy);
console.log(lengthOfDummy);
}


My console now prints out this:
//Dummy
[]
// lenght of dummy
0

A few seconds later, it updates to:
// Dummy
["0xkadj", "0xhuad", "0xhhadh"];
// length of dummy
0

Can someone tell me how I can assure that the variable will be set AFTER the function a has been executed for my "dummy" variable?
I googled for solutions, finding stuff like Promises and timeouts, but I was simply to dump to adapt the solutions I found. Would be great if someone can clear this up for me.

Thank you guys in advance!