Why can't a function return an object or array, but it can return a value?

Question

I originally wanted to set the properties for creating a new cell style.
But it reminds me that the style is undefined?
Can it return sum but not newSty?

get('A', 'B');
alert(newSty);
//alert(sum);
//newSty.properties={

//}
function get(a, b) {
    var baseSty = app.documents[0].cellStyles.itemByName(a);
    sum = a + b;
    var newSty = baseSty.parent.cellStyles.itemByName(b);
    //return sum;
    return newSty;
}

rob day · Accepted Answer

alert(newSty) throws an error because newSty is only defined inside of the get(a, b) function.

This does not throw an error if the document has cell styles named A and B:

//x variable equals the returned value of get(a, b)
var x = get('A', 'B')
alert("Returned: " + x);
alert("Style Name: " + x.name);

function get(a, b) {
    var baseSty = app.documents[0].cellStyles.itemByName(a);
    //this doesn’t do anything
    sum = a + b;
    var newSty = baseSty.parent.cellStyles.itemByName(b);
    //returns cellStyle object;
    return newSty;
}

rob day · Answer

Are you trying to set the basedOn property of cell style B to cell style A?

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