best practice for Q and promises

Question

I'm really new to Q js library.

I need to write a prepare function that may return value momentarily or may need to wait for promise:

var prepare = function() {
    var result = {};
    result.aaa = 1;

    if (something) {
        callToFunction().then(function () {
            result.bbb = 2
        })
    }

    if (something2) {
        callToFunction().then(function () {
            result.ccc = 2
        })
    }


    // here I have code to define other properties
    // in sync (like `aaa`) or async (like `bbb`) manner



    return result; //I need to return promise here
}

prepare().then(function(result) {use result....})

can someone fix prepare function so I can always safely use prepare().then

someone may think it is related to How to maintain a promise-like API in this case?

but it is not. Function is responsible to define result object.

• first: define aaa property
• second: in some cases function will define bbb property
• third: define other properties in sync (like aaa) or async (like bbb) manner