Before you learn about switch expressions, you may want to review the tutorial on Switch Statements
Switch Expressions
How are switch expressions different from switch statements?
- Switch expressions yield a value, typically assigned to a variable.
- Switch expressions use the keyword
yield and do not require a break statement as yield will return a value and the execution stops.
- Switch expressions require a
; at the end.
Basic Structure of a Switch Expression
<type> returnVariable = switch (<variable>) {
case <value>: {
yield valueAssignedtoreturnVariable;
}
//additional case statements
default: {
yield valueAssignedtoreturnVariable;
}
};
Revisiting the Grade Level Example
We've embedded the expression into a statement requiring a semi-colon at the end.
Note that the keyword yield is being used to return the value for each case.
Basic Structure of a Switch Expression with Lambda
<type> returnVariable = switch (<variable>) {
case <value> -> //value to assign if variable == value ;
//additional case statements
default -> //value to assign if no case values match the value of variable ;
};
The above example re-written with lambda:
Resources
Calculator - Using Conditionals and Lambda Mini-Lab