sdf

headFirst/interfaces/gadget/tape.go

@@ -0,0 +1,27 @@
+package gadget
+
+import "fmt"
+
+type TapePlayer struct {
+	batteries string
+}
+
+func (t TapePlayer) Play(song string) {
+	fmt.Println("Playing", song)
+}
+
+func (t TapePlayer) Stop() {
+	fmt.Println("Stopped")
+}
+
+type TapeRecorder struct {
+	Microphones int
+}
+
+func (t TapeRecorder) Play(song string) {
+	fmt.Println("Playing", song)
+}
+
+func (t TapeRecorder) Stop() {
+	fmt.Println("Stopped")
+}

headFirst/interfaces/go.mod

@@ -0,0 +1,3 @@
+module main
+
+go 1.24.6

headFirst/interfaces/main.go

@@ -0,0 +1,26 @@
+package main
+
+import "main/gadget"
+
+type Player interface {
+	Play(string)
+	Stop()
+}
+
+func playlist(device Player, songs []string) {
+	for _, song := range songs {
+		device.Play(song)
+	}
+	device.Stop()
+}
+
+func main() {
+	var player Player
+	player = gadget.TapePlayer{}
+	mixtape := []string{"Red Plesen'", "Coco Jambo","Barbied Girl"}
+	playlist(player,mixtape)
+
+	player = gadget.TapeRecorder{}
+	mixtape = []string{"Dectl'", "Carmen","Scatman"}
+	playlist(player,mixtape)
+}

headFirst/recover/data.txt

@@ -0,0 +1,5 @@
+1
+2
+3
+4
+5

headFirst/recover/go.mod

@@ -0,0 +1,3 @@
+module main
+
+go 1.24.6

headFirst/recover/main.go

@@ -0,0 +1,45 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+)
+
+func OpenFile(filename string) (*os.File, error) {
+	fmt.Println("Opening file",filename)
+	return os.Open(filename)
+}
+
+func CloseFile(filename *os.File) {
+	fmt.Println("Closing file")
+	filename.Close()
+}
+
+func GetNums(filename string) ([]int,error) {
+	var nums []int
+	file,err :=OpenFile("data.txt")
+	defer CloseFile(file)
+	if err != nil {
+		return  nil,err
+	}
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		number,err := strconv.ParseInt(scanner.Text(),10,0)
+		if err != nil {
+			return  nil,err
+		}
+		fmt.Println(number)
+		nums = append(nums, int(number))
+		}
+	if scanner.Err() != nil {
+		return nil,scanner.Err()
+	}
+	return nums,err
+}
+
+
+func main() {
+	GetNums("data.txt")
+}