update: functional log parser

advfuncs/logparser/01/update.go

@@ -0,0 +1,33 @@
+// 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
+
+// update updates all the parsing results using the given parsing result
+func update(p *parser, r result) {
+	if p.lerr != nil {
+		return
+	}
+
+	if !filter(r) {
+		return
+	}
+
+	// Collect the unique domains
+	if _, ok := p.sum[r.domain]; !ok {
+		p.domains = append(p.domains, r.domain)
+	}
+
+	// Keep track of total and per domain visits
+	p.total += r.visits
+
+	// create and assign a new copy of `visit`
+	p.sum[r.domain] = result{
+		domain: r.domain,
+		visits: r.visits + p.sum[r.domain].visits,
+	}
+}