Switch Case in Dart
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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