slices and arrays

arrays.go

@@ -11,6 +11,8 @@ func testArrays() {
   assert(len(fruits) == __int__) // the length is what the length is
   assert(cap(fruits) == __int__) // it can hold no more
 
+  assert(fruits == [4]string{}) // comparing arrays is not like comparing apples and oranges
+
   tasty_fruits := fruits[1:3] // defining oneself as a variation of another
   assert(tasty_fruits[0] == __string__) // slices of arrays share some data
   assert(tasty_fruits[1] == __string__) // albeit slightly askewed
@@ -24,4 +26,8 @@ func testArrays() {
   assert(fruits[1] == __string__) // how about the second?
   assert(fruits[2] == __string__) // surely one of these must have changed
   assert(fruits[3] == __string__) // but who can know these things
+
+  veggies := [...]string{"carrot", "pea"}
+
+  assert(len(veggies) == __int__) // array literals need not repeat an obvious length
 }

setup_koans_test.go

@@ -17,9 +17,10 @@ var __bool__ bool = false
 var __float32__ float32 = -1.0
 
 func TestKoans(t *testing.T) {
-  testNumbers()
+  //testNumbers()
   //testStrings()
   //testArrays()
+  testSlices()
 
   fmt.Printf("\n%c[32;1mYou won life. Good job.\n\n", 27)
 }

slices.go

@@ -0,0 +1,18 @@
+package go_koans
+
+func testSlices() {
+  fruits := []string{"apple", "orange", "mango"}
+
+  assert(fruits[0] == __string__) // slices seem like arrays
+  assert(len(fruits) == __int__) // in nearly all respects
+
+  tasty_fruits := fruits[1:3] // we can even slice slices
+  assert(tasty_fruits[0] == __string__) // slices of slices also share some data
+  assert(tasty_fruits[1] == __string__) // but once again slightly askewed
+
+  tasty_fruits[0] = "lemon"
+
+  assert(fruits[0] == __string__) // but once again
+  assert(fruits[1] == __string__) // some things have changed
+  assert(fruits[2] == __string__) // since our data is not our own
+}