Question

Is there a better way to write this JavaScript?

switch (l) {
    //A
    case '1-1-1':
    case '1-1-2':
    case '1-2-1':
    case '2-1-1':
    case '3-1-1':
        obj.result = 'A';
        break;
    //B
    case '1-2-2':
    case '1-2-3':
    case '2-2-2':
    case '2-2-3':
    case '3-2-2':
    case '3-3-1':
        obj.result = 'B';
        break;
    //C
    case '1-3-2':
    case '1-3-3':
    case '2-3-2':
    case '3-2-3':
        obj.result = 'C';
        break;
    //D
    case '3-3-2':
    case '3-3-3':
        obj.result = 'D';
        break;
    default:
        obj.result = 'AA';
        break;
}

Answer 1

The lookup table, as mentioned by Thilo in the comments:

var lookup =
{
    '1-1-1': 'A',
    '1-1-2': 'A',
    '1-2-1': 'A',
    '2-1-1': 'A',
    '3-1-1': 'A',

    '1-2-2': 'B',
    '1-2-3': 'B',
    '2-2-2': 'B',
    '2-2-3': 'B',
    '3-2-2': 'B',
    '3-3-1': 'B',

    '1-3-2': 'C',
    '1-3-3': 'C',
    '2-3-2': 'C',
    '3-2-3': 'C',
    '3-3-2': 'C',

    '3-3-3': 'D'
};

and its usage:

obj.result = lookup[l] || 'AA';

I can’t say this is really any better than the switch version.