Return value of when #

The when structure always returns a value, which may be used by assigning to a variable or returned. It is not required to use the return value, though.

const result = when someVar { /* ... */ }

Use in a return statement #

The following is valid joelang code:

f foo {
	// do();

    return when someVar { /* ... */ };  ✅
}

whens don't have to return anything #

when someNumber {
	1 -> small(), // call a function, ignore return value since there is no assignment
}