refactored label generator script and README

headFirst/flag/go.mod

@@ -0,0 +1,3 @@
+module main
+
+go 1.25.3

headFirst/flag/main.go

@@ -0,0 +1,15 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+)
+
+func main() {
+	var nFlag = flag.Int("n",1234,"this is test int flag")
+	var sFlag = flag.String("s","lolkek","this is test string flag")
+	flag.Parse()
+
+	fmt.Println(*nFlag)
+	fmt.Println(*sFlag)
+}

headFirst/generics/main.go

@@ -63,5 +63,7 @@ func main() {
 
   var e Test
   _ = json.Unmarshal(b,&e)
-  fmt.Println(e)
+  fmt.Printf("Output is %v",e)
+
+  
 }

headFirst/routines/main.go

@@ -2,45 +2,50 @@ package main
 
 import (
 	"fmt"
-	"io"
-	"log"
-	"net/http"
+	"sync"
+	// "time"
 )
 
-func errCheck(err error) {
-	if err != nil {
-		log.Fatalln("Error happened %v\n",err)
+
+// func a(name int, channel chan int, wg *sync.WaitGroup) {
+// 	defer wg.Done()
+// 	for i := 0; i < 3; i++ {
+// 		fmt.Printf("Number %d is sending\n",name)
+// 		channel <- name
+// 	}
+// 	fmt.Printf("Num %d is ended\n",name)
+// }
+func test(name int,channel chan []int, wg *sync.WaitGroup) {
+	defer wg.Done()
+	inter := []int{}
+	for i := 0; i < 3; i++ {
+		inter = append(inter, name)
 	}
+	channel <- inter
 }
 
-func responseSize(url string, out chan Page) {
-	fmt.Println("Getting ",url)
-	response,err := http.Get(url)
-	errCheck(err)
-	defer response.Body.Close()
 
-	body,err := io.ReadAll(response.Body)
-	errCheck(err)
-
-	out <- Page{URL: url, Size: len(body)}
-
-}
-
-type Page struct {
-	URL string
-	Size int
-}
 
 func main() {
-	size := make(chan Page)
-	urls :=[]string{"https://google.com","https://golang.org","https://golang.org/doc"}
-	for _,url := range urls {
-		go responseSize(url,size)
+
+	var wg sync.WaitGroup
+	_list := []int{1,2,3,4,5}
+	a_chan := make(chan []int)
+
+	for _,k := range _list {
+		wg.Add(1)
+		go test(k,a_chan, &wg)
 	}
-	fmt.Println("--------")
-	for i:=0; i < len(urls);i++ {
-		page := <- size
-		fmt.Printf("%s: %d\n",page.URL,page.Size)
+
+	go func() {
+		wg.Wait()
+		close(a_chan)
+	}()
+
+	// for i := range a_chan {
+	// 	fmt.Println(i)
+	// }
+	for i := range a_chan {
+	fmt.Println(i)
 	}
-	fmt.Println("End main()")
 }