clojure-koans/src/koans/vectors.clj

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(meditations
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"You can use vectors in clojure to create an 'Array' like structure"
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(= __ (count [42]))
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"You can create a vector in several ways"
(= __ (vec nil))
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"And populate it in either of these ways"
(= __ (vec '(1)))
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"There is another way as well"
(= __ (vector nil))
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"But you can populate it with any number of elements at once"
(= [1 __] (vec '(1 2)))
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"And add to it as well"
(= __ (conj (vec nil) 333))
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"You can get the first element of a vector like so"
(= __ (first [:peanut :butter :and :jelly]))
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"And the last in a similar fashion"
(= __ (last [:peanut :butter :and :jelly]))
"Or any index if you wish"
(= __ (nth [:peanut :butter :and :jelly] 3))
"You can also slice a vector"
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(= __ (subvec [:peanut :butter :and :jelly] 1 3))
"Equality with collections is in terms of values"
(___ (list 1 2 3) (vector 1 2 3)))