post-recording code adjustment

Author: GoesToEleven

02_package/main/main.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"github.com/GoesToEleven/GolangTraining/02_package/stringutil"
 	"github.com/GoesToEleven/GolangTraining/02_package/icomefromalaska"
+	//someAlias "github.com/GoesToEleven/GolangTraining/02_package/icomefromalaska"
 )
 
 func main() {

05_blank-identifier/02_http-get_example/01_with-error-checking/main.go

@@ -8,7 +8,7 @@ import (
 )
 
 func main() {
-	res, err := http.Get("http://www.mcleods.com/")
+	res, err := http.Get("http://www.geekwiseacademy.com/")
 	if err != nil {
 		log.Fatal(err)
 	}

05_blank-identifier/02_http-get_example/02_no-error-checking/main.go

@@ -7,8 +7,8 @@ import (
 )
 
 func main() {
-	res, _ := http.Get("http://www.mcleods.com/")
+	res, _ := http.Get("http://www.geekwiseacademy.com/")
 	page, _ := ioutil.ReadAll(res.Body)
 	res.Body.Close()
 	fmt.Printf("%s", page)
-}
+}

21_interfaces/01_interface/02_interface/main.go

@@ -21,5 +21,6 @@ func info(z shape) {
 
 func main() {
 	s := square{10}
+	fmt.Printf("%T\n",s)
 	info(s)
 }

22_go-routines/13_channels_fan-out_fan-in/05_challenge-solution/main.go

@@ -3,10 +3,11 @@ package main
 import (
 	"fmt"
 	"time"
+	"sync/atomic"
 )
 
-var workerID int
-var publisherID int
+var workerID int64
+var publisherID int64
 
 func main() {
 	input := make(chan string)
@@ -22,8 +23,12 @@ func main() {
 
 // publisher pushes data into a channel
 func publisher(out chan string) {
-	publisherID++
-	thisID := publisherID
+	atomic.AddInt64(&publisherID, 1)
+	// atomic was added after recording to fix a race condition
+	// discover race conditions with the -race flag
+	// for example: go run -race main.go
+	// learn about the atomic package: https://godoc.org/sync/atomic#AddInt64
+	thisID := atomic.LoadInt64(&publisherID)
 	dataID := 0
 	for {
 		dataID++
@@ -34,8 +39,12 @@ func publisher(out chan string) {
 }
 
 func workerProcess(in <-chan string) {
-	workerID++
-	thisID := workerID
+	atomic.AddInt64(&workerID, 1)
+	// atomic was added after recording to fix a race condition
+	// discover race conditions with the -race flag
+	// for example: go run -race main.go
+	// learn about the atomic package: https://godoc.org/sync/atomic#AddInt64
+	thisID := atomic.LoadInt64(&workerID)
 	for {
 		fmt.Printf("%d: waiting for input...\n", thisID)
 		input := <-in