Reviews

02-code-project-organization/6-interface-producer/store/store.go

@@ -1,6 +1,6 @@
 package store
 
-type Storer interface {
+type CustomerStorage interface {
 	StoreCustomer(customer Customer) error
 	GetCustomer(id string) (Customer, error)
 	UpdateCustomer(customer Customer) error

03-data-types/19-floating-points/main.go

@@ -5,6 +5,12 @@ import "fmt"
 func main() {
 	var n float32 = 1.0001
 	fmt.Println(n * n)
+
+	var a float64
+	positiveInf := 1 / a
+	negativeInf := -1 / a
+	nan := a / a
+	fmt.Println(positiveInf, negativeInf, nan)
 }
 
 func f1(n int) float64 {

03-data-types/20-slice-length-cap/main.go

@@ -12,9 +12,7 @@ func main() {
 	s = append(s, 2)
 	print(s)
 
-	s = append(s, 3)
+	s = append(s, 3, 4, 5)
-	s = append(s, 4)
-	s = append(s, 5)
 	print(s)
 
 	s1 := make([]int, 3, 6)

05-strings/37-string-iteration/main.go

@@ -17,6 +17,9 @@ func main() {
 	for i, r := range runes {
 		fmt.Printf("position %d: %c\n", i, r)
 	}
+
+	s2 := "hello"
+	fmt.Printf("%c\n", rune(s2[4]))
 }
 
 func getIthRune(largeString string, i int) rune {

06-functions-methods/43-named-result-parameters/main.go

@@ -1,5 +1,7 @@
 package main
 
+import "io"
+
 func f(a int) (b int) {
 	b = a
 	return
@@ -16,7 +18,7 @@ func (l loc) getCoordinates(address string) (lat, lng float32, err error) {
 	return 0, 0, nil
 }
 
-func ReadFull(r Reader, buf []byte) (n int, err error) {
+func ReadFull(r io.Reader, buf []byte) (n int, err error) {
 	for len(buf) > 0 && err == nil {
 		var nr int
 		nr, err = r.Read(buf)
@@ -25,9 +27,3 @@ func ReadFull(r Reader, buf []byte) (n int, err error) {
 	}
 	return
 }
-
-type Reader struct{}
-
-func (Reader) Read([]byte) (int, error) {
-	return 0, nil
-}

07-error-management/50-compare-error-type/main.go

@@ -14,7 +14,7 @@ func (t transientError) Error() string {
 	return fmt.Sprintf("transient error: %v", t.err)
 }
 
-func GetTransactionAmountHandler(w http.ResponseWriter, r *http.Request) {
+func handler(w http.ResponseWriter, r *http.Request) {
 	transactionID := r.URL.Query().Get("transaction")
 
 	amount, err := getTransactionAmount1(transactionID)
@@ -48,13 +48,12 @@ func getTransactionAmountFromDB1(id string) (float32, error) {
 	return 0, nil
 }
 
-func GetTransactionAmount2(w http.ResponseWriter, r *http.Request) {
+func handler2(w http.ResponseWriter, r *http.Request) {
 	transactionID := r.URL.Query().Get("transaction")
 
 	amount, err := getTransactionAmount2(transactionID)
 	if err != nil {
-		terr := transientError{}
+		if errors.As(err, &transientError{}) {
-		if errors.As(err, &terr) {
 			http.Error(w, err.Error(), http.StatusServiceUnavailable)
 		} else {
 			http.Error(w, err.Error(), http.StatusBadRequest)