feat: implement wait group

fundamental/wait_group.go

@@ -0,0 +1,24 @@
+package fundamental
+
+import (
+	"fmt"
+	"sync"
+)
+
+func ImplementWaitGroup() {
+	var wg sync.WaitGroup
+
+	for i := 0; i < 5; i++ {
+		var data = fmt.Sprintf("data %d", i)
+
+		wg.Add(1)
+		go doPrint(&wg, data)
+	}
+
+	wg.Wait()
+}
+
+func doPrint(wg *sync.WaitGroup, message string) {
+	defer wg.Done()
+	fmt.Println(message)
+}

main.go

@@ -1,12 +1,16 @@
 package main
 
 import (
-	"explore-go/practice"
-	"fmt"
+	"explore-go/fundamental"
+	"runtime"
 )
 
 func main() {
-	go practice.RestFulAPIServer()
-	practice.HttpClient()
-	fmt.Scanln()
+	runtime.GOMAXPROCS(2)
+
+	fundamental.ImplementWaitGroup()
+
+	// go practice.RestFulAPIServer()
+	// practice.HttpClient()
+	// fmt.Scanln()
 }