How can you use the debugger and breakpoints within an IDE like Visual Studio Code or Android Studio to actually step through your Flutter app's code line by line and inspect the exact current values of your variables?

Setting a breakpoint at a specific line of code within your chosen IDE causes your running Flutter app to automatically pause execution the very instant it actually reaches that exact specific line, letting you then carefully inspect the exact current values held within all of your local variables at that particular moment, step through your subsequent code one individual line at a time, and closely observe exactly how your program's overall state actually changes as each successive line executes, which is often considerably more efficient and genuinely reliable for diagnosing a genuinely complex logic bug compared to simply relying purely on scattered print statements alone.

// Click in the gutter next to a line number in VS Code to set a breakpoint
void calculateTotal() {
  final tax = subtotal * 0.08;  // <- breakpoint set here
  total = subtotal + tax;
}