2014-05-02 21:37:11 +00:00
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(ns koans.04-sets
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(:require [koan-engine.core :refer :all]))
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2014-01-26 00:04:22 +00:00
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2010-02-06 23:43:06 +00:00
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(meditations
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2013-03-04 23:30:00 +00:00
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"You can create a set by converting another collection"
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(= #{3} (set __))
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2010-02-06 23:43:06 +00:00
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2013-03-04 23:30:00 +00:00
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"Counting them is like counting other collections"
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2010-10-29 15:45:47 +00:00
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(= __ (count #{1 2 3}))
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2010-09-30 23:34:02 +00:00
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2013-03-04 23:30:00 +00:00
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"Remember that a set is a *mathematical* set"
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2010-07-26 23:20:42 +00:00
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(= __ (set '(1 1 2 2 3 3 4 4 5 5)))
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2010-02-06 23:43:06 +00:00
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2010-07-26 23:20:42 +00:00
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"You can ask clojure for the union of two sets"
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(= __ (clojure.set/union #{1 2 3 4} #{2 3 5}))
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2010-02-06 23:43:06 +00:00
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2010-07-26 23:20:42 +00:00
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"And also the intersection"
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(= __ (clojure.set/intersection #{1 2 3 4} #{2 3 5}))
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2010-02-06 23:43:06 +00:00
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2010-07-26 23:20:42 +00:00
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"But don't forget about the difference"
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(= __ (clojure.set/difference #{1 2 3 4 5} #{2 3 5})))
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