update book code

eBook/examples/chapter_8/invert_map.go

@@ -1,23 +1,29 @@
-package main
-import (
-    "fmt"
-)
-
-var (
-    barVal = map[string]int{"alpha": 34, "bravo": 56, "charlie": 23,
-                            "delta": 87, "echo": 56, "foxtrot": 12,
-                            "golf": 34, "hotel": 16, "indio": 87,
-                            "juliet": 65, "kili": 43, "lima": 98}
-)
-
-func main() {
-    invMap := make(map[int]string, len(barVal))
-    for k, v := range barVal {
-        invMap[v] = k
-    }
-    fmt.Println("inverted:")
-    for k, v := range invMap {
-        fmt.Printf("Key: %v, Value: %v / ", k, v)
-    }
-    fmt.Println()
-}
+// invert_map.go
+package main
+
+import (
+	"fmt"
+)
+
+var (
+	barVal = map[string]int{"alpha": 34, "bravo": 56, "charlie": 23, "delta": 87,
+		"echo": 56, "foxtrot": 12, "golf": 34, "hotel": 16, "indio": 87, "juliet": 65, "kilo": 43, "lima": 98}
+)
+
+func main() {
+	invMap := make(map[int]string, len(barVal))
+	for k, v := range barVal {
+		invMap[v] = k
+	}
+	fmt.Println("inverted:")
+	for k, v := range invMap {
+		fmt.Printf("Key: %v, Value: %v / ", k, v)
+	}
+}
+/* Output:
+inverted:
+Key: 12, Value: foxtrot / Key: 16, Value: hotel / Key: 87, Value: delta / Key: 23, Value: charlie / 
+Key: 65, Value: juliet / Key: 43, Value: kilo / Key: 56, Value: bravo / Key: 98, Value: lima / 
+Key: 34, Value: golf /
+*/
+