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Matthew Davidson 2023-01-04 17:15:43 +01:00
parent 91bccfa55f
commit ee1381cfa9
1 changed files with 5 additions and 5 deletions
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10
src/koans/20_java_interop.clj
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@ -3,17 +3,17 @@
(meditations
"You may have done more with Java than you know"
(= __ (class "warfare")) ; hint: try typing (javadoc "warfare") in the REPL
(= java.lang.String (class "warfare")) ; hint: try typing (javadoc "warfare") in the REPL
"The dot signifies easy and direct Java interoperation"
(= __ (.toUpperCase "select * from"))
(= "SELECT * FROM" (.toUpperCase "select * from"))
"But instance method calls are very different from normal functions"
(= ["SELECT" "FROM" "WHERE"] (map ___ ["select" "from" "where"]))
(= ["SELECT" "FROM" "WHERE"] (map #(.toUpperCase %) ["select" "from" "where"]))
"Constructing might be harder than breaking"
(= 10 (let [latch (java.util.concurrent.CountDownLatch. __)]
(= 10 (let [latch (java.util.concurrent.CountDownLatch. 10)]
(.getCount latch)))
"Static methods are slashing prices!"
(== __ (Math/pow 2 10)))
(== 1024 (Math/pow 2 10)))