structs

investmentCalculator/go.mod

@@ -0,0 +1,3 @@
+module example.com/investment-calculator
+
+go 1.23.1

structs-practice/go.mod

@@ -0,0 +1,3 @@
+module example.com/note
+
+go 1.23.1

structs-practice/main.go

@@ -0,0 +1,55 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"example.com/note/note"
+	"os"
+	"strings"
+)
+
+func main() {
+	title, content := getNoteData()
+
+	userNote, err := note.New(title, content)
+
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	userNote.Display()
+	err = userNote.Save()
+
+	if err != nil {
+		fmt.Println("Saving the note failed")
+		return
+	}
+
+	fmt.Println("Saving the note succeeded!")
+}
+
+func getNoteData() (string, string) {
+	title := getUserInput("Note title:")
+
+	content := getUserInput("Note content:")
+
+	return title, content
+}
+
+func getUserInput(prompt string) (string) {
+	fmt.Printf("%v ", prompt)
+	
+	reader := bufio.NewReader(os.Stdin)
+
+	text, err :=reader.ReadString('\n')
+
+	if err != nil {
+		return ""
+	}
+
+	text = strings.TrimSuffix(text, "\n")
+	text = strings.TrimSuffix(text, "\r")
+
+	return text
+}

structs-practice/note/note.go

@@ -0,0 +1,45 @@
+package note
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"os"
+	"strings"
+	"time"
+)
+
+type Note struct {
+	Title string `json:"title"`
+	Content string `json:"content"`
+	CreatedAt time.Time `json:"created_at"`
+}
+
+func (note Note) Display() {
+	fmt.Printf("Your note title %v has the following content:\n\n%v", note.Title, note.Content)
+}
+
+func (note Note) Save() error {
+	fileName := strings.ReplaceAll(note.Title, " ", "_")
+	fileName = strings.ToLower(fileName) + ".json"
+
+	json, err := json.Marshal(note)
+
+	if err != nil {
+		return err
+	}
+
+	return os.WriteFile(fileName, json, 0644)
+}
+
+func New(title, content string) (Note, error) {
+	if title == "" || content == "" {
+		return Note{}, errors.New("Invalid input")
+	}
+
+	return Note{
+		Title: title,
+		Content: content,
+		CreatedAt: time.Now(),
+	}, nil
+}

structs.go

@@ -1,22 +0,0 @@
-package main
-
-import (
-	"fmt"
-)
-
-func main() {
-	firstName := getUserData("Please enter your first name: ")
-	lastName := getUserData("Please enter your last name: ")
-	birthdate := getUserData("Please enter your birthdate (MM/DD/YYYY): ")
-
-	// ... do something awesome with that gathered data!
-
-	fmt.Println(firstName, lastName, birthdate)
-}
-
-func getUserData(promptText string) string {
-	fmt.Print(promptText)
-	var value string
-	fmt.Scan(&value)
-	return value
-}

structs/structs.go

@@ -0,0 +1,40 @@
+package main
+
+import (
+	"fmt"
+	"example.com/structs/user"
+)
+
+func main() {
+	userFirstName := getUserData("Please enter your first name: ")
+	userLastName := getUserData("Please enter your last name: ")
+	userBirthdate := getUserData("Please enter your birthdate (MM/DD/YYYY): ")
+
+	var appUser *user.User
+
+	appUser, err := user.New(userFirstName, userLastName, userBirthdate)
+
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	admin := user.NewAdmin("test@example.com", "test123")
+
+	admin.OutputUserDetails()
+	admin.ClearUserName()
+	admin.OutputUserDetails()
+
+	// ... do something awesome with that gathered data!
+
+	appUser.OutputUserDetails()
+	appUser.ClearUserName()
+	appUser.OutputUserDetails()
+}
+
+func getUserData(promptText string) string {
+	fmt.Print(promptText)
+	var value string
+	fmt.Scanln(&value)
+	return value
+}

structs/user/user.go

@@ -0,0 +1,55 @@
+package user
+
+import (
+	"errors"
+	"fmt"
+	"time"
+)
+
+type User struct {
+	firstName string
+	lastName string
+	birthdate string
+	createdAt time.Time
+}
+
+type Admin struct {
+	email string
+	password string
+	User
+}
+
+func (u User) OutputUserDetails() {
+	fmt.Println(u.firstName, u.lastName, u.birthdate)
+}
+
+func (u *User) ClearUserName() {
+	u.firstName = ""
+	u.lastName = ""
+}
+
+func NewAdmin(email, password string) Admin {
+	return Admin{
+		email: email,
+		password: password,
+		User: User{
+			firstName: "ADMIN",
+			lastName: "ADMIN",
+			birthdate: "---",
+			createdAt: time.Now(),
+		},
+	}
+}
+
+func New(firstName, lastName, birthdate string) (*User, error) {
+	if firstName == "" || lastName == "" || birthdate == "" {
+		return nil, errors.New("First name, last name, and birthdate are required")
+	}
+
+	return &User{
+		firstName: firstName,
+		lastName: lastName,
+		birthdate: birthdate,
+		createdAt: time.Now(),
+	}, nil
+}