fix: coding style and file format for all example.

eBook/examples/chapter_8/invert_map.go

@@ -1,29 +1,29 @@
-// 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 /
-*/
-
+// 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 /
+*/

eBook/examples/chapter_8/make_maps.go

@@ -20,6 +20,7 @@ func main() {
 	fmt.Printf("Map assigned at \"two\" is: %d\n", mapLit["two"])
 	fmt.Printf("Map literal at \"ten\" is: %d\n", mapLit["ten"])
 }
+
 /* Output:
 Map literal at "one" is: 1
 Map created at "key2" is: 3.141590

eBook/examples/chapter_8/map_func.go

@@ -1,13 +1,15 @@
-// map_func.go
-package main
-import "fmt"
-
-func main() {
-	mf := map[int]func() int{
-		1: func() int { return 10 },
-		2: func() int { return 20 },
-		5: func() int { return 50 },
-	}
-	fmt.Println(mf)
-}
-// Output:  map[1:0x10903be0 5:0x10903ba0 2:0x10903bc0]
+// map_func.go
+package main
+
+import "fmt"
+
+func main() {
+	mf := map[int]func() int{
+		1: func() int { return 10 },
+		2: func() int { return 20 },
+		5: func() int { return 50 },
+	}
+	fmt.Println(mf)
+}
+
+// Output:  map[1:0x10903be0 5:0x10903ba0 2:0x10903bc0]

eBook/examples/chapter_8/map_testelement.go

@@ -1,33 +1,33 @@
-package main
-
-import "fmt"
-
-func main() {
-	var value int
-	var isPresent bool
-
-	map1 := make(map[string]int)
-	map1["New Delhi"] = 55
-	map1["Bejing"] = 20
-	map1["Washington"] = 25
-
-	value, isPresent = map1["Bejing"]
-	if isPresent {
-		fmt.Printf("The value of \"Bejing\" in map1 is: %d\n", value)
-	} else {
-		fmt.Println("map1 does not contain Bejing")
-	}
-
-	value, isPresent = map1["Paris"]
-	fmt.Printf("Is \"Paris\" in map1 ?: %t\n", isPresent)
-	fmt.Printf("Value is: %d\n", value)
-
-	// delete an item:
-	delete(map1, "Washington")
-	value, isPresent = map1["Washington"]
-	if isPresent {
-		fmt.Printf("The value of \"Washington\" in map1 is: %d\n", value)
-	} else {
-		fmt.Println("map1 does not contain Washington")
-	}
-}
+package main
+
+import "fmt"
+
+func main() {
+	var value int
+	var isPresent bool
+
+	map1 := make(map[string]int)
+	map1["New Delhi"] = 55
+	map1["Bejing"] = 20
+	map1["Washington"] = 25
+
+	value, isPresent = map1["Bejing"]
+	if isPresent {
+		fmt.Printf("The value of \"Bejing\" in map1 is: %d\n", value)
+	} else {
+		fmt.Println("map1 does not contain Bejing")
+	}
+
+	value, isPresent = map1["Paris"]
+	fmt.Printf("Is \"Paris\" in map1 ?: %t\n", isPresent)
+	fmt.Printf("Value is: %d\n", value)
+
+	// delete an item:
+	delete(map1, "Washington")
+	value, isPresent = map1["Washington"]
+	if isPresent {
+		fmt.Printf("The value of \"Washington\" in map1 is: %d\n", value)
+	} else {
+		fmt.Println("map1 does not contain Washington")
+	}
+}

eBook/examples/chapter_8/maps_forrange.go

@@ -1,15 +1,15 @@
-package main
-
-import "fmt"
-
-func main() {
-	map1 := make(map[int]float32)
-	map1[1] = 1.0
-	map1[2] = 2.0
-	map1[3] = 3.0
-	map1[4] = 4.0
-
-	for key, value := range map1 {
-		fmt.Printf("key is: %d - value is: %f\n", key, value)
-	}
-}
+package main
+
+import "fmt"
+
+func main() {
+	map1 := make(map[int]float32)
+	map1[1] = 1.0
+	map1[2] = 2.0
+	map1[3] = 3.0
+	map1[4] = 4.0
+
+	for key, value := range map1 {
+		fmt.Printf("key is: %d - value is: %f\n", key, value)
+	}
+}

eBook/examples/chapter_8/slice_maps.go

@@ -1,27 +1,28 @@
-// slice_maps.go
-package main
-
-import (
-	"fmt"
-)
-
-func main() {
-// Version A:
-	items := make([]map[int]int, 5)
-	for i := range items {
-        items[i] = make(map[int]int, 1) 
-        items[i][1] = 2
-	}
-	fmt.Printf("Version A: Value of items: %v\n", items)
-// Version B:
-	items2 := make([]map[int]int, 5)
-	for _, item := range items2 {
-        item = make(map[int]int, 1) // item is only a copy of the slice element.
-        item[1] = 2                 // This 'item' will be lost on the next iteration.
-	}
-	fmt.Printf("Version B: Value of items: %v\n", items2)
-}
-/* Output:
-Version A: Value of items: [map[1:2] map[1:2] map[1:2] map[1:2] map[1:2]]
-Version B: Value of items: [map[] map[] map[] map[] map[]]
-*/
+// slice_maps.go
+package main
+
+import (
+	"fmt"
+)
+
+func main() {
+	// Version A:
+	items := make([]map[int]int, 5)
+	for i := range items {
+		items[i] = make(map[int]int, 1)
+		items[i][1] = 2
+	}
+	fmt.Printf("Version A: Value of items: %v\n", items)
+	// Version B:
+	items2 := make([]map[int]int, 5)
+	for _, item := range items2 {
+		item = make(map[int]int, 1) // item is only a copy of the slice element.
+		item[1] = 2                 // This 'item' will be lost on the next iteration.
+	}
+	fmt.Printf("Version B: Value of items: %v\n", items2)
+}
+
+/* Output:
+Version A: Value of items: [map[1:2] map[1:2] map[1:2] map[1:2] map[1:2]]
+Version B: Value of items: [map[] map[] map[] map[] map[]]
+*/

eBook/examples/chapter_8/sort_map.go

@@ -1,43 +1,43 @@
-// sort_map.go
-// the telephone alphabet:
-package main
-
-import (
-	"fmt"
-	"sort"
-)
-
-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() {
-	fmt.Println("unsorted:")
-	for k, v := range barVal {
-		fmt.Printf("Key: %v, Value: %v / ", k, v)
-	}
-	keys := make([]string, len(barVal))
-	i := 0
-	for k, _ := range barVal {
-		keys[i] = k
-		i++
-	}
-	sort.Strings(keys)
-	fmt.Println()
-	fmt.Println("sorted:")
-	for _, k := range keys {
-		fmt.Printf("Key: %v, Value: %v / ", k, barVal[k])
-	}
-}
-/* Output:
-unsorted:
-Key: indio, Value: 87 / Key: echo, Value: 56 / Key: juliet, Value: 65 / Key: charlie, Value: 23 / 
-Key: hotel, Value: 16 / Key: lima, Value: 98 / Key: bravo, Value: 56 / Key: alpha, Value: 34 / 
-Key: kilo, Value: 43 / Key: delta, Value: 87 / Key: golf, Value: 34 / Key: foxtrot, Value: 12 / 
-sorted:
-Key: alpha, Value: 34 / Key: bravo, Value: 56 / Key: charlie, Value: 23 / Key: delta, Value: 87 / 
-Key: echo, Value: 56 / Key: foxtrot, Value: 12 / Key: golf, Value: 34 / Key: hotel, Value: 16 / 
-Key: indio, Value: 87 / Key: juliet, Value: 65 / Key: kilo, Value: 43 / Key: lima, Value: 98 / 
-*/
-
+// sort_map.go
+// the telephone alphabet:
+package main
+
+import (
+	"fmt"
+	"sort"
+)
+
+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() {
+	fmt.Println("unsorted:")
+	for k, v := range barVal {
+		fmt.Printf("Key: %v, Value: %v / ", k, v)
+	}
+	keys := make([]string, len(barVal))
+	i := 0
+	for k := range barVal {
+		keys[i] = k
+		i++
+	}
+	sort.Strings(keys)
+	fmt.Println()
+	fmt.Println("sorted:")
+	for _, k := range keys {
+		fmt.Printf("Key: %v, Value: %v / ", k, barVal[k])
+	}
+}
+
+/* Output:
+unsorted:
+Key: indio, Value: 87 / Key: echo, Value: 56 / Key: juliet, Value: 65 / Key: charlie, Value: 23 /
+Key: hotel, Value: 16 / Key: lima, Value: 98 / Key: bravo, Value: 56 / Key: alpha, Value: 34 /
+Key: kilo, Value: 43 / Key: delta, Value: 87 / Key: golf, Value: 34 / Key: foxtrot, Value: 12 /
+sorted:
+Key: alpha, Value: 34 / Key: bravo, Value: 56 / Key: charlie, Value: 23 / Key: delta, Value: 87 /
+Key: echo, Value: 56 / Key: foxtrot, Value: 12 / Key: golf, Value: 34 / Key: hotel, Value: 16 /
+Key: indio, Value: 87 / Key: juliet, Value: 65 / Key: kilo, Value: 43 / Key: lima, Value: 98 /
+*/