Complete type switch TODO

examples/switch/switch.go

@@ -40,6 +40,22 @@ func main() {
     default:
         fmt.Println("it's after noon")
     }
-}
 
-// todo: type switches
+    // A type `switch` compares types instead of values.  You
+    // can use this to discover the the type of an interface
+    // value.  In this example, the variable `t` will have the
+    // type corresponding to its clause.
+    whatAmI := func(i interface{}) string {
+        switch t := i.(type) {
+        case bool:
+            return "I am a bool"
+        case int:
+            return "I am an int"
+        default:
+            return fmt.Sprintf("Can't handle type %T", t)
+        }
+    }
+    fmt.Println(whatAmI(1))
+    fmt.Println(whatAmI(true))
+    fmt.Println(whatAmI("hey"))
+}

examples/switch/switch.sh

@@ -2,3 +2,6 @@ $ go run switch.go
 write 2 as two
 it's the weekend
 it's before noon
+I am an int
+I am a bool
+Can't handle type string