Question

What happens when returnThis.label is referenced?
Can one give me an example of how this might be used?

returnThis = {
        'label' : aLabel ? this.value : false
        };

Answer 1

This makes use of ternary syntax.

aLabel ? this.value : false means: if aLabel is truthy (true, 1, “a”, etc.), evaluate to this.value. Otherwise, evaulate to false.

The code is equivalent to the following:

returnThis = {};
if(aLabel) {
    returnThis.label = this.value;
} else {
    returnThis.label = false;
}