setProperty

API - this is just a helper function to set a default value, but if a value already exists it will do nothing.

return function()
    setProperty(data, 'test', 20);
    log(data.test); --prints 20
    
    data.test = 30;
    log(data.test); --prints 30
    
    setProperty(data, 'test', 20); --this will not set the property, since it already exists!
    log(data.test); --prints 30
end

Notice the last log prints 30 because the previous setProperty was ignored (because a value already exists there)