Given pseudo-code (Ruby-ish):

due = 100
cards = cards.map do |card|
    card.applied_balance = max(0, due - card.balance)
    due -= card.applied_balance

Notice how due changes at each turn, and each successive item in
"cards" sees the change.

What's an idiomatic way to do this in Clojure without using refs?

-Steven

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