let res1 = 0, 
    res2 = 0, 
    res3 = 0, 
    res4 = 0, 
    res5 = 0, 
    res6 = 0;

let toss = Math.floor(Math.random() * 6 + 1);
                    
switch (toss) {
    case 1: 
        res1 += 1;
        break;
    case 2: 
        res2 += 1;
        break;
    case 3: 
        res3 += 1;
        break;
    case 4: 
        res4 += 1;
        break;
    case 5: 
        res5 += 1;
        break;
    case 6: 
        res6 += 1;
        break;  
    default:
     console.log('Error: toss out a range')          
}