typescript switch case

1let day : number = 4;
2
3switch (day) {
4    case 0:
5        console.log("It is a Sunday.");
6        break;
7    case 1:
8        console.log("It is a Monday.");
9        break;
10    case 2:
11        console.log("It is a Tuesday.");
12        break;
13    case 3:
14        console.log("It is a Wednesday.");
15        break;
16    case 4:
17        console.log("It is a Thursday.");
18        break;
19    case 5:
20        console.log("It is a Friday.");
21        break;
22    case 6:
23        console.log("It is a Saturday.");
24        break;
25    default:
26        console.log("No such day exists!");
27        break;
28}

1switch(expression) { 
2   case constant-expression1: { 
3      //statements; 
4      break; 
5   } 
6   case constant_expression2: { 
7      //statements; 
8      break; 
9   } 
10   default: { 
11      //statements; 
12      break; 
13   } 
14} 
15

1switch(expression) { 
2   case constant-expression1: { 
3      //statements; 
4      break; 
5   } 
6   case constant_expression2: { 
7      //statements; 
8      break; 
9   } 
10   default: { 
11      //statements; 
12      break; 
13   } 
14}