(Just a personal log so I don't forget some basic steps here. There may or may not be a Part 2)
First, install relevant stuff. This is usually, at the minimum, something like sudo apt-get install clojure1.4
$ java -cp /usr/share/java/clojure-1.4.jar clojure.main
Clojure 1.4.0
user=>
Basic Arithmetic
user=> (+ 2 3)
5
Basic string operation
user=> "foo"
"foo"
user=> (concat "foo" "bar")
(\f \o \o \b \a \r)
Variables
user=> (def x 4)
#'user/x
user=> (+ x 5)
9
user=> (def strarr ["foo" "bar"])
#'user/strarr
Basic arrays
user=> (count [6 5 3 4 2])
5
user=> (get strarr 1)
"bar"
user=> (get strarr 0)
"foo"
Basic maps
user=> (def mymap {:foo "Here is foo" :bar "... and here is bar!"})
#'user/mymap
user=> (get mymap :bar)
"... and here is bar!"
Errors
user=> (^ 6 4)
IllegalArgumentException Metadata must be Symbol,Keyword,String or Map clojure.lang.LispReader$MetaReader.invoke (LispReader.java:720)
4
RuntimeException Unmatched delimiter: ) clojure.lang.Util.runtimeException (Util.java:170)
user=> (% 6 4)
CompilerException java.lang.RuntimeException: Unable to resolve symbol: % in this context, compiling:(NO_SOURCE_PATH:2)
Stack Overflow (!)
user=> (defn foo [x] (foo (- x 1)))
#'user/foo
user=> (foo 4)
StackOverflowError user/foo (NO_SOURCE_FILE:7)
Simple function
user=> (defn expt [x y] (if (= y 0) 1 (* x (expt x (- y 1)))))
#'user/expt
user=> (expt 6 4)
1296
Default REPL namespace (user)
user=> (user/expt 6 4)
1296
For loop
user=> (dotimes [_ 5] (println "Hello World."))
Hello World.
Hello World.
Hello World.
Hello World.
Hello World.
nil
While loop
user=> (for [i (range 5) j (range 5) :when (and (> i 0) (< i j))] (println (* i j)))
(2
3
4
nil nil 6
8
nil nil 12
nil nil)
Switch case
user=> (for [i (range 5) j (range 5)]
(case (* i j)
0 "zero"
(* i j)))
("zero" "zero" "zero" "zero" "zero" "zero" 1 2 3 4 "zero" 2 4 6 8 "zero" 3 6 9 12 "zero" 4 8 12 16)
... the rest in Part 2, if there is one.