if a rank has finishes > 0 then it's also got a rank, first_finish and time Doesn't that kinda make sense? How would you want it to display the player's rank? I'm unsure what language you're using, but it's really easy to check if a property is null, and there make the assumption that the player doesn't have a finish.
What's wrong with using keys on the object, also as Ryozuki said it's really easy to loop over an object.
You're only fair criticism is that there is no documentation, which I assume is because deen throw this togheter in 30 minutes :)
TL:DR You're incredibly lazy, and expect the API to be doing everything for you. <3 @Sans 
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