example of method on a file-specific type

methods/methods.go

@@ -19,9 +19,23 @@ func (v *vertex) scale(s float64) {
     v.y *= s
 }
 
+type myfloat float64
+
+func (f myfloat) abs() float64 {
+    if f < 0 {
+        return float64(-f)
+    }
+    return float64(f)
+}
+
 func main() {
     v := vertex{1.1, 2.2}
     fmt.Println(v.abs())
     v.scale(12)
     fmt.Println(v.abs())
+
+    f := myfloat(12.23)
+    fmt.Println(f.abs())
+    fmt.Println(-f)
+    fmt.Println((-f).abs())
 }