Fallthrough in switch statement for iOS/Objective-C

Question

Say I have a switch statement with five cases, but only two real methods ever being called, like so:

switch (condition) {
    case conditionOutcome1: 

        [self firstMethod];
        break;

    case conditionOutcome2: 
        [self secondMethod];
        break;

    case conditionOutcome3:

        [self firstMethod];
        break;

    case conditionOutcome4: 

        [self firstMethod];

        break;
    case conditionOutcome5: 

        [self secondMethod];
        break;

    default:
        break;
}

Is it safe to group up the cases, like so?

    switch (condition) {

    case conditionOutcome1:
    case conditionOutcome3:
    case conditionOutcome4: 

        [self firstMethod];
        break;

    case conditionOutcome2: 
    case conditionOutcome5: 

        [self secondMethod];
        break;


    default:
        break;
}

It works fine, but I've never used it before in objective-c so I'd like to make sure I'm not causing any problems by saving a few lines of code.

Thanks!

Answer 1

Just adding to the other answers, it's called a fallthrough, you can read about it here.

Answer 2

Yes, it's fine to do that.

I've used it before. It stops duplicate code.

Answer 3

Yes 100% safe to use

switch (condition) {

case conditionOutcome1:
case conditionOutcome3:
case conditionOutcome4: 

    [self firstMethod];
    break;

case conditionOutcome2: 
case conditionOutcome5: 

    [self secondMethod];
    break;


default:
    break; }

This is always used, for multiple cases which have same set of actions (duplicate codes) to be performed.

As all the cases will be performed untill a break get encountered.