fix: avoid global state (#126)

Signed-off-by: Carlos Alexandro Becker <caarlos0@gmail.com>

README.md

@@ -95,7 +95,8 @@ do any I/O, so for the command we'll just return `nil`, which translates to "no
 command."
 
 ```go
-var initialModel = model{
+func main() {
+	initialModel := model{
 		// Our to-do list is just a grocery list
 		choices:  []string{"Buy carrots", "Buy celery", "Buy kohlrabi"},
 
@@ -103,6 +104,7 @@ var initialModel = model{
 		// the  map like a mathematical set. The keys refer to the indexes
 		// of the `choices` slice, above.
 		selected: make(map[int]struct{}),
+	}
 }
 
 func (m model) Init() tea.Cmd {
@@ -228,6 +230,11 @@ The last step is to simply run our program. We pass our initial model to
 
 ```go
 func main() {
+    initialModel := model{
+        choices:  []string{"Buy carrots", "Buy celery", "Buy kohlrabi"},
+        selected: make(map[int]struct{}),
+    }
+
     p := tea.NewProgram(initialModel)
     if err := p.Start(); err != nil {
         fmt.Printf("Alas, there's been an error: %v", err)

tutorials/basics/README.md

@@ -59,7 +59,8 @@ do any I/O, so for the command we'll just return `nil`, which translates to "no
 command."
 
 ```go
-var initialModel = model{
+func main() {
+    initialModel := model{
         // Our to-do list is just a grocery list
         choices:  []string{"Buy carrots", "Buy celery", "Buy kohlrabi"},
 
@@ -67,6 +68,7 @@ var initialModel = model{
         // the  map like a mathematical set. The keys refer to the indexes
         // of the `choices` slice, above.
         selected: make(map[int]struct{}),
+	}
 }
 
 func (m model) Init() tea.Cmd {
@@ -192,6 +194,11 @@ The last step is to simply run our program. We pass our initial model to
 
 ```go
 func main() {
+    initialModel := model{
+       choices:  []string{"Carrots", "Celery", "Kohlrabi"},
+       selected: make(map[int]struct{}),
+    }
+
     p := tea.NewProgram(initialModel)
     if err := p.Start(); err != nil {
         fmt.Printf("Alas, there's been an error: %v", err)

tutorials/basics/main.go

@@ -13,11 +13,6 @@ type model struct {
 	selected map[int]struct{}
 }
 
-var initialModel = model{
-	choices:  []string{"Carrots", "Celery", "Kohlrabi"},
-	selected: make(map[int]struct{}),
-}
-
 func (m model) Init() tea.Cmd {
 	return nil
 }
@@ -72,6 +67,11 @@ func (m model) View() string {
 }
 
 func main() {
+	initialModel := model{
+		choices:  []string{"Carrots", "Celery", "Kohlrabi"},
+		selected: make(map[int]struct{}),
+	}
+
 	p := tea.NewProgram(initialModel)
 	if err := p.Start(); err != nil {
 		fmt.Printf("Alas, there's been an error: %v", err)