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

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

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