Switch statement syntax for same action through different cases

Question

Two constants (1+2) share the same case statement. I don´t want to double the code.

What is the right syntax to do this?

switch (expression) {
        case 0:
            [self taskA];
            break;
        case 1:
            [self taskB];
            break;
        case 2:
            [self taskB]
            break;
        default:
            break;
    }

Answer 1

Use :

switch (expression) {
    case 0:
        [self taskA];
        break;
    case 1:
    case 2:
        [self taskB];
        break;
    default:
        break;
}

Edit 1:

In switch we say a term called fall-through. Whenever control reaches to a label say case 0: it falls till break is found. On break control is sent to the closing braces of switch.

If break is not encountered it goes to next case as in case then case 2. So above case 1 and case 2 shares one break statement.