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Adds immutable queue impl using vector
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(ns data-structures.queue.vector) | ||
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(defn ->Queue | ||
[] | ||
[]) | ||
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(defn enqueue | ||
[queue value] | ||
(conj queue value)) | ||
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(defn dequeue | ||
[queue] | ||
(if (empty? queue) | ||
queue | ||
(subvec queue 1))) | ||
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(defn peek-queue | ||
[queue] | ||
(first queue)) | ||
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(defn empty-queue? | ||
[queue] | ||
(empty? queue)) |
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(ns data-structures.queue.vector-test | ||
(:require | ||
[clojure.test :refer [deftest testing is]] | ||
[data-structures.queue.vector :as q])) | ||
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(deftest ->Queue-test | ||
(is (vector? (q/->Queue)))) | ||
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(deftest enqueue-test | ||
(is (= [10 20 30] (-> (q/->Queue) (q/enqueue 10) (q/enqueue 20) (q/enqueue 30))))) | ||
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(deftest dequeue-test | ||
(is (= [] (-> (q/->Queue) (q/dequeue)))) | ||
(is (= [20 30] (-> (q/->Queue) (q/enqueue 10) (q/enqueue 20) (q/enqueue 30) (q/dequeue))))) | ||
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(deftest peek-queue-test | ||
(is (nil? (-> (q/->Queue) (q/peek-queue))) "returns nil for empty queue") | ||
(is (= 10 (-> (q/->Queue) (q/enqueue 10) (q/enqueue 20) (q/enqueue 30) (q/peek-queue))))) | ||
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(deftest empty-queue?-test | ||
(is (q/empty-queue? (q/->Queue))) | ||
(is (false? (-> (q/->Queue) (q/enqueue 10) (q/enqueue 20) q/empty-queue?)))) |