Create the meditations of a string koan

Covers
* String creation
* String concatenation
* Counting strings characters and getting them
* Difference between chars and strings
* Substrings
* string/join w/ and w/o separators
* string/split-lines
* .indexOf and .lastIndexOf
* string/trim
* char? and string?
* blank?

resources/koans.clj

@@ -10,9 +10,29 @@
                       "hello"
                       3]}]
 
- ["02_strings" {"__" [
-                
-                ]}]
+ ["02_strings" {"__" ["hello"
+                "world"
+                "Cool "
+                "right?"
+                0
+                11
+                false
+                6 11
+                "123"
+                ", "
+                "1" "2" "3"
+                "olleh"
+                "hello"
+                13
+                -1
+                "hello world"
+                true
+                false
+                false
+                "a"
+                true
+                true
+                false]}]
 
  ["03_lists" {"__" [1 2 3 4 5
                  1

src/koans/02_strings.clj

@@ -1,4 +1,70 @@
 (ns koans.02-strings
-  (:require [koan-engine.core :refer :all]))
+  (:require [koan-engine.core :refer :all]
+            [clojure.string :as string]))
 
-(meditations)
+(meditations
+  "A string is nothing more than text surrounded by double quotes"
+  (= __ "hello")
+
+  "But double quotes are just magic on top of something deeper"
+  (= __ (str 'world))
+
+  "You can do more than create strings, you can put them together"
+  (= "Cool right?" (str __ __))
+
+  "You can even get certain characters"
+  (= \C (get "Characters" __))
+
+  "Or even count the characters"
+  (= __ (count "Hello World"))
+
+  "But strings and characters are not the same"
+  (= __ (= \c "c"))
+
+  "What if you only wanted to get part of a string?"
+  (= "World" (subs "Hello World" __ __))
+
+  "How about joining together elements in a list?"
+  (= __ (string/join '(1 2 3)))
+
+  "What if you wanted to seperate them out?"
+  (= "1, 2, 3" (string/join __ '(1 2 3)))
+
+  "Maybe you want to seperate out all you're lines"
+  (= [__ __ __] (string/split-lines "1\n2\n3"))
+
+  "You may want to make sure you're words are backwards"
+  (= __ (string/reverse "hello"))
+
+  "Maybe you want to find the index of the first occurence of a substring"
+  (= 0 (.indexOf "hello world" __))
+
+  "Or maybe the last index of the same"
+  (= __ (.lastIndexOf "hello world, hello" "hello"))
+
+  "But when something doesn't exist, it turns up negative"
+  (= __ (.indexOf "hello world" "bob"))
+
+  "Sometimes you don't want whitespace cluttering the front and back"
+  (= __ (string/trim "  \nhello world \t \n"))
+
+  "You can check if something is a char"
+  (= __ (char? \c))
+
+  "But it may not be"
+  (= __ (char? "a"))
+
+  "But chars aren't strings"
+  (= __ (string? \b))
+
+  "Strings are strings"
+  (= true (string? __))
+
+  "Some strings may be blank"
+  (= __ (string/blank? ""))
+
+  "Even if at first glance they aren't"
+  (= __ (string/blank? " \n \t  "))
+
+  "However, most strings aren't blank"
+  (= __ (string/blank? "hello?\nare you out there?")))