types

about_types.go

@@ -0,0 +1,13 @@
+package go_koans
+
+type coolNumber int
+
+func (cn coolNumber) double() int {
+  return int(cn) * 2
+}
+
+func aboutTypes() {
+  i := coolNumber(4)
+  assert(i == coolNumber(__int__)) // values can be converted between compatible types
+  assert(i.double() == __int__)    // you can add methods on any type you define
+}

setup_koans_test.go

@@ -22,6 +22,7 @@ func TestKoans(t *testing.T) {
   aboutStrings()
   aboutArrays()
   aboutSlices()
+  aboutTypes()
   aboutControlFlow()
   aboutEnumeration()
   aboutAnonymousFunctions()