reorganize: starting with funcs

28-methods/xxx-log-parser-methods/summarize.go

@@ -0,0 +1,38 @@
+// 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 report and errors if any
+func summarize(rep *report, errs ...error) {
+	fmt.Printf("%-30s %10s\n", "DOMAIN", "VISITS")
+	fmt.Println(strings.Repeat("-", 45))
+
+	next, cur := rep.iterator()
+	for next() {
+		rec := cur()
+		fmt.Printf("%-30s %10d\n", rec.domain, rec.visits)
+	}
+	fmt.Printf("\n%-30s %10d\n", "TOTAL", rep.total.visits)
+
+	// only handle the errors once
+	dumpErrs(errs...)
+}
+
+// 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)
+		}
+	}
+}