let a = 2 + 2,
b = a++, //5
c = a * b, //4 * 5 = 20
d = a + b + c; //4 + 5 + 20
console.log(d);
switch (c) {
case 28:
alert( 'Too small' );
break;
case 29:
alert( 'Exactly!' );
break;
case 30:
alert( 'Too large' );
break;
default:
alert( "I don't know such values" );
}