add: new interfaces

interfaces/oop/final/report.go

@@ -0,0 +1,40 @@
+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+type notifier interface {
+	notify(func(r result))
+}
+
+type parser interface {
+	parse() error
+	notifier
+}
+
+type iterator interface {
+	each(func(result))
+}
+
+type analyser interface {
+	analyse(result)
+	iterator
+}
+
+type summarizer interface {
+	summarize(iterator) error
+}
+
+func report(a analyser, p parser, s summarizer) error {
+	p.notify(a.analyse)
+
+	if err := p.parse(); err != nil {
+		return err
+	}
+
+	return s.summarize(a)
+}