move: methods to interfaces

29-interfaces/logparser-funcs/summarize.go

@@ -0,0 +1,36 @@
+// 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
+
+import (
+	"fmt"
+	"strings"
+)
+
+// summarize prints the parsing results.
+func summarize(s *summary) {
+	fmt.Printf("%-30s %10s\n", "DOMAIN", "VISITS")
+	fmt.Println(strings.Repeat("-", 45))
+
+	for next, cur := iteratorSummary(s); next(); {
+		r := cur()
+		fmt.Printf("%-30s %10d\n", r.domain, r.visits)
+	}
+
+	t := totalsSummary(s)
+	fmt.Printf("\n"+"%-30s %10d\n", "TOTAL", t.visits)
+}
+
+// this variadic func simplifies the multiple error handling
+func dumpErrs(errs ...error) {
+	for _, err := range errs {
+		if err != nil {
+			fmt.Printf("> Err: %s\n", err)
+		}
+	}
+}