I have a leaderboard array that looks something like this:

`[{:member=>"1", :score=>7.0, :rank=>1}, {:member=>"5", :score=>6.0, :rank=>2}, {:member=>"4", :score=>5.0, :rank=>3}, {:member=>"3", :score=>4.0, :rank=>4}, {:member=>"2", :score=>3.0, :rank=>5}]`

I also have an array of active user ids `[3,5]`.

How can I get the member number of the highest ranked active user and assign that to a variable? The leaderboard array will always be in order of rank.