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Initial data commit

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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 72d218235f
commit f23f22d71c
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14
Task/Stack/Clojure/stack-2.clj Normal file
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(defprotocol StackOps
(push-stack [this x] "Pushes an item to the top of the stack.")
(pop-stack [this] "Pops an item from the top of the stack.")
(top-stack [this] "Shows what's on the top of the stack.")
(empty-stack? [this] "Tests whether or not the stack is empty."))
(deftype Stack [elements]
StackOps
(push-stack [x] (dosync (alter elements conj x)))
(pop-stack [] (let [fst (first (deref elements))]
(dosync (alter elements rest)) fst))
(top-stack [] (first (deref elements)))
(empty-stack? [] (= () (deref elements))))
(def stack (Stack (ref ())))