add iota example to go

go/iota.go

@@ -0,0 +1,23 @@
+package main
+
+// from https://humungus.tedunangst.com/r/honk/v/tip/f/hfcs.go
+
+type filtType uint
+
+const (
+	filtNone filtType = iota
+	filtAny
+	filtReject
+	filtSkipMedia
+	filtHide
+	filtCollapse
+	filtRewrite
+)
+
+var filtNames = []string{"None", "Any", "Reject", "SkipMedia", "Hide", "Collapse", "Rewrite"}
+
+func (ft filtType) String() string {
+	return filtNames[ft]
+}
+
+type afiltermap map[filtType][]*Filter