Switch Case in Dart

In Dart, switch-case statements are a great tool for managing multiple conditions in a clean and organized way. They serve as a more efficient alternative to lengthy if-else chains, making your code easier to read and maintain.

Syntax:

switch (expression) { 
 case value1: 
 // Body of value1
 break; 

 case value2: 
 // Body of value2 
 break; 

 // Add more cases as needed

 default: 
 // Body of default case 
 break; 
}

The default case is the case whose body is executed if none of the above cases matches the condition.

Rules to follow in switch case:

• There can be any number of cases. But values should not be repeated.
• The case statements can include only constants. It should not be a variable or an expression.
• There should be a flow control i.e. break within cases. If it is omitted then it will show an error.
• The default case is optional.
• The nested switch is also there thus you can have a switch inside the switch.

Normal switch-case statement

Example:

void main() {  int gfg = 1;  switch (gfg)  {  case 1: {  print("GeeksforGeeks number 1");  }  break;  case 2: {  print("GeeksforGeeks number 2");  }  break;  case 3: {  print("GeeksforGeeks number 3");  }  break;  default: {  print("This is default case");  }  break;  } } 

Output:

GeeksforGeeks number 1

Nested switch-case statement

Example:

void main() {  int gfg1 = 1;  String gfg2 = "Geek";  switch (gfg1) {  case 1: {  switch (gfg2) {  case 'Geek': {  print("Welcome to GeeksforGeeks");  }  }  }   break;    case 2: {  print("GeeksforGeeks number 2");  }   break;      default: {  print("This is default case");  } break;  } } 

Output:

Welcome to GeeksforGeeks

Conclusion

Switch-case statements in Dart offer a handy way to manage multiple constant conditions, making them a great alternative to lengthy if-else chains. One key difference is that switch statements focus solely on compile-time constants. While it's not always necessary to include a break statement, skipping it can lead to some unexpected behavior, as it allows the program to "fall through" to the next case. You can also add a default case to catch any conditions that don't match the others. Interestingly, Dart supports nested switch-case statements too, although they're not used as often.