Switch Case in Dart

Switch Case in Dart

A switch statement is an alternative to else if statements which allows a variable to be tested for equality against a list of values.

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3 min read

  • A switch statement is an alternative to elseif statements which allows a variable to be tested for equality against a list of values.

  • Each value is called a case, and the variable being switched on is checked for each switch case.

  • Wherever an expression value matches with a case value, the body of that case will be executed.

  • The switch will be terminated using a break statement. Here break statement is compulsory. Otherwise, the dart analysis engine will throw a syntax error.

  • Only the default case break is optional. Otherwise, in all cases break is compulsory.

Syntax

switch (expression) {
  case ONE:
    {
      statement(s);
    }
  break;

  case TWO:
    {
      statement(s);
    }
  break;

  default:
    {
      statement(s);
    }
}

Rules of the Switch Case

  • The default case is optional.

  • All case expressions must be unique.

  • The case statements can include only constants. It cannot be a variable or an expression.

  • The data type of the variable and the case expression must match.

  • There can be any number of case statements within a switch.

Example

void main() {
  var grade = "A";

  switch (grade) {
    case "A":
      {
        print("Excellent");
      }
      break;

    case "B":
      {
        print("Good");
      }
      break;

    case "C":
      {
        print("Fair");
      }
      break;

    case "D":
      {
        print("Poor");
      }
      break;

    default:
      {
        print("Invalid choice");
      }
      break;
  }
}

So, guys, That’s all you need to know about switch cases. Please let me know if I miss something. I’ll be happy to learn from you. Till Then Keep Loving, Keep Coding. I’ll surely catch you up in the next article. Jai Hind, Vande Mataram 🇮🇳

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