clojure-koans/koans/about_vectors.clj
2010-02-06 17:00:08 -05:00

27 lines
723 B
Clojure

(meditations
"You can use vectors in clojure to create an 'Array' like structure"
(= __ (.size (vec nil)))
"You can create a vector in two ways"
(= [] (vec nil))
"And populate it in either of these ways"
(= [1] (vec '(1)))
"But you can populate it with any number of elements at once"
(= [1 __] (vec '(1 2)))
"And add to it as well"
(= __ (conj (vec nil) 333))
"You can get the first element of a vector like so"
(= :peanut (first [:peanut :butter :and :jelly]))
"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"
(= __ (subvec [:peanut :butter :and :jelly] 1 3)))