1switch(expression) {
2  case x:
3    // code block
4    break;
5  case y:
6    // code block
7    break;
8  default:
9    // code block
10}

1switch (a) {
2    case 1:
3        alert('case 1 executed');
4        break;
5    case 2:
6        alert("case 2 executed");
7        break;
8   case 3:
9        alert("case 3 executed");
10        break;
11    case 4:
12        alert("case 4 executed");
13        break;
14    default:
15        alert("default case executed");
16}

1//javascript multiple case switch statement
2var color = "yellow";
3var darkOrLight="";
4switch(color) {
5    case "yellow":case "pink":case "orange":
6        darkOrLight = "Light";
7        break;
8    case "blue":case "purple":case "brown":
9        darkOrLight = "Dark";
10        break;
11    default:
12        darkOrLight = "Unknown";
13}
14
15//darkOrLight="Light"

1let color = "black";
2
3switch(color){
4    case "red":
5        console.log("color is red");
6        break;
7    case "white":
8        console.log("color is white");
9        break;
10    case "black":
11        console.log("color is black");
12        break;
13    default:
14        console.log("unknow color");
15}

1var myvalue='val1';//or other values; val2 val3 valx
2switch(myvalue) {
3  case 'val1':
4      	console.log('var myvalue is '+ myvalue);
5    	//other code ...
6    break;
7  case 'val2':
8    	console.log('var myvalue is '+ myvalue);
9    	//other code ...
10    break;
11  default:
12    	// when all the other values not covered with cases above
13    	// other code ...
14}

1switch(expression) {
2  case a:
3    // case logic
4    break;
5  case b:
6    // case logic
7    break;
8  default:
9    // default logic
10}