add: for statement loop exercises

13-loops/08-word-finder-labeled-break/main.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
+
+import (
+	"fmt"
+	"os"
+	"strings"
+)
+
+const corpus = "lazy cat jumps again and again and again"
+
+func main() {
+	words := strings.Fields(corpus)
+	query := os.Args[1:]
+
+	// labels and other names do not share the same scope
+	// var queries string
+	// _ = queries
+
+	// this label labels the parent loop below
+	// label's scope is the whole function body
+	// not only it's block
+queries:
+	for _, q := range query {
+		for i, w := range words {
+			if q == w {
+				fmt.Printf("#%-2d: %q\n", i+1, w)
+
+				// find the first word then quit
+				break queries
+			}
+		}
+	}
+}