Dart Switch Statements

The Switch statement is a control flow structure that allows a program to execute different code blocks based on the value of an expression.

Syntax

switch (expression) {
  case value1:
    // code block executed if the expression matches value1
    break;
  case value2:
    // code block executed if the expression matches value2
    break;
  //Additional cases as needed
  default:
    // code block executed if no case matches the expression
}

• expression: The value or variable being evaluated.
• case: Specifies a value to be compared with the expression.
• break: Terminates the switch statement, preventing fall-through to subsequent cases.
• default: Optional. Specifies code to be executed if none of the cases match the expression.

Example

In the following example, the switch statement is used to determine and print a message based on the value of the fruit variable:

void main() {
  String fruit = 'apple';

  switch (fruit) {
    case 'banana':
      print('You chose a banana!');
      break;
    case 'apple':
      print('You chose an apple!');
      break;
    case 'orange':
      print('You chose an orange!');
      break;
    default:
      print('Invalid fruit selection');
  }
}

Copy to clipboard
Copy to clipboard

The corresponding case is executed if the value is banana, apple, or orange. If none of the cases match, the default block is executed, printing an error message.