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35 lines
933 B
Clojure
35 lines
933 B
Clojure
(ns koans.04-vectors
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(:require [koan-engine.core :refer :all]))
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(meditations
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"You can use vectors in clojure as array-like structures"
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(= 1 (count [42]))
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"You can create a vector from a list"
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(= [1] (vec '(1)))
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"Or from some elements"
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(= [nil nil] (vector nil nil))
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"But you can populate it with any number of elements at once"
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(= [1 2] (vec '(1 2)))
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"Conjoining to a vector is different than to a list"
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(= [111 222 333] (conj [111 222] 333))
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"You can get the first element of a vector like so"
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(= :peanut (first [:peanut :butter :and :jelly]))
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"And the last in a similar fashion"
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(= :jelly (last [:peanut :butter :and :jelly]))
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"Or any index if you wish"
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(= :jelly (nth [:peanut :butter :and :jelly] 3))
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"You can also slice a vector"
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(= [:butter :and] (subvec [:peanut :butter :and :jelly] 1 3))
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"Equality with collections is in terms of values"
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(= (list 1 2 3) (vector 1 2 3)))
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