fix: coding style and file format for all example.

eBook/examples/chapter_11/methodset2.go

@@ -1,48 +1,49 @@
-// methodset2.go
-package main
-
-import (
-	"fmt"
-)
-
-type List []int
-func (l List) Len() int { return len(l) }
-func (l *List) Append(val int) { *l = append(*l, val) }
-
-type Appender interface {
-        Append(int)
-}
-
-func CountInto(a Appender, start, end int) {
-        for i := start; i <= end; i++ {
-                a.Append(i)
-        }
-}
-
-type Lener interface {
-        Len() int
-}
-
-func LongEnough(l Lener) bool {
-        return l.Len()*10 > 42
-}
-
-func main() {
-		// A bare value
-        var lst List
-		// compiler error:
-		// cannot use lst (type List) as type Appender in function argument:
-		// List does not implement Appender (Append method requires pointer receiver)
-        // CountInto(lst, 1, 10) // INVALID: Append has a pointer receiver
-		
-        if LongEnough(lst) {  // VALID: Identical receiver type
-                fmt.Printf(" - lst is long enough")
-        }
-
-        // A pointer value
-        plst := new(List)
-        CountInto(plst, 1, 10) // VALID: Identical receiver type
-        if LongEnough(plst) {  // VALID: a *List can be dereferenced for the receiver
-                fmt.Printf(" - plst is long enough")  //  - plst is long enoug
-        }      
-}
+// methodset2.go
+package main
+
+import (
+	"fmt"
+)
+
+type List []int
+
+func (l List) Len() int        { return len(l) }
+func (l *List) Append(val int) { *l = append(*l, val) }
+
+type Appender interface {
+	Append(int)
+}
+
+func CountInto(a Appender, start, end int) {
+	for i := start; i <= end; i++ {
+		a.Append(i)
+	}
+}
+
+type Lener interface {
+	Len() int
+}
+
+func LongEnough(l Lener) bool {
+	return l.Len()*10 > 42
+}
+
+func main() {
+	// A bare value
+	var lst List
+	// compiler error:
+	// cannot use lst (type List) as type Appender in function argument:
+	// List does not implement Appender (Append method requires pointer receiver)
+	// CountInto(lst, 1, 10) // INVALID: Append has a pointer receiver
+
+	if LongEnough(lst) { // VALID: Identical receiver type
+		fmt.Printf(" - lst is long enough")
+	}
+
+	// A pointer value
+	plst := new(List)
+	CountInto(plst, 1, 10) // VALID: Identical receiver type
+	if LongEnough(plst) {  // VALID: a *List can be dereferenced for the receiver
+		fmt.Printf(" - plst is long enough") //  - plst is long enoug
+	}
+}