Scribbles for my bad memory

pushReplacement

Imagine you're replacing an old road sign with a new one. The old one is gone, and there's no way to know it was ever there. That's what pushReplacement does in Flutter.

Usage:

• Navigator.pushReplacement(context, newRoute)

What It Does:

• Replaces the current route with a new route.
• The current route is removed from the stack, making way for the new route.
• The removed route is completely gone—pressing the back button won’t bring it back.

When to Use It:

• Ideal for scenarios like replacing a login screen with a home screen after a user logs in. You don’t want them to go back to the login screen, right?

Code Example:

Navigator.pushReplacement(
  context,
  MaterialPageRoute(builder: (context) => HomeScreen()),
);

pushAndRemoveUntil

Now, think of pushAndRemoveUntil as clearing a cluttered desk, keeping only the essentials. You decide which items stay and which go. This function allows more control over which routes to remove.

Usage:

• Navigator.pushAndRemoveUntil(context, newRoute, (route) => condition)

What It Does:

• Pushes a new route and removes routes below it until a specified condition is met.
• You provide a condition to determine which routes to keep or discard.

When to Use It:

• Perfect for situations like logging out, where you want to return to a clean slate (the login screen) and remove all previous screens.

Code Example:

Navigator.pushAndRemoveUntil(
  context,
  MaterialPageRoute(builder: (context) => LoginScreen()),
  (Route<dynamic> route) => false, // Remove all previous routes.
);

Key Differences

1. Scope of Operation:

   • pushReplacement swaps only the top route.
   • pushAndRemoveUntil can clear out multiple routes based on your condition.

2. Stack Control:

   • pushReplacement provides straightforward, one-route replacement.
   • pushAndRemoveUntil allows for a more flexible navigation reset.

3. Use Case Scenarios:

   • Use pushReplacement for simple replacement needs.
   • Use pushAndRemoveUntil for complex navigation flows requiring cleanup of multiple routes.