strings rock

arrays.go

@@ -1,8 +1,5 @@
 package go_koans
 
-var __string__ string = "impossibly lame value"
-var __int__ int = -1
-
 func testArrays() {
   fruits := [4]string{"apple", "orange", "mango"}
 

basics.go

@@ -1,8 +1,7 @@
 package go_koans
 
-var __ bool
-
 func testBasics() {
-  //assert(__ == true) // what is truth?
+  assert(__bool__ == true) // what is truth?
+
   //assert(!__ != true) // in it there is nothing false
 }

setup_koans_test.go

@@ -10,10 +10,14 @@ import (
   "strings"
 )
 
+var __string__ string = "impossibly lame value"
+var __int__ int = -1
+var __bool__ bool = false
+
 func TestKoans(t *testing.T) {
-  testBasics()
+  //testBasics()
   testStrings()
-  testArrays()
+  //testArrays()
 
   fmt.Printf("\n%c[32;1mYou won life. Good job.\n\n", 27)
 }

strings.go

@@ -1,7 +1,31 @@
 package go_koans
 
-func testStrings() {
-  //var __ string
+import "fmt"
 
-  //assert("a" + __ == "abc")
+func testStrings() {
+  assert("a" + "bc" == "abc") // string concatenation need not be difficult
+  assert(len("abc") == 3) // and bounds are thoroughly checked at compile time
+
+  assert("abc"[0] == 'a') // their contents are reminiscent of C
+
+  assert("smith"[2:] == "ith") // slicing may omit the end point
+  assert("smith"[:4] == "smit") // or the beginning
+  assert("smith"[2:4] == "it") // or neither
+  assert("smith"[:] == "smith") // or both
+
+  assert("smith" == "smith") // they can be compared directly
+  assert("smith" > "foo") // and allow correct but generally useless comparisons
+  assert("smith" < "zoo") // i suppose maybe this could be useful.. someday
+
+  bytes := []byte{'a', 'b', 'c'}
+  assert(string(bytes) == "abc") // strings can be created from byte-slices
+
+  bytes[0] = 'z'
+  assert(string(bytes) == "zbc") // byte-slices can be mutated, although strings cannot
+
+  assert(fmt.Sprintf("hello %s", "world") == "hello world") // our old friend sprintf returns
+  assert(fmt.Sprintf("hello \"%s\"", "world") == "hello \"world\"") // quoting is familiar
+  assert(fmt.Sprintf("hello %q", "world") == "hello \"world\"") // although it can be done easilier
+
+  assert(fmt.Sprintf("your balance: %d and %0.2f", 3, 4.5589) == "your balance: 3 and 4.56") // "the root of all evil" is actually a misquotation, by the way
 }