JavaScript 2.0-The Complete Reference, Second ... - freecodingtutorial

}
case 'D': alert("Not so good.");
deansList = false;
academicProbation = true;
break;
case 'F': alert("Back to the books.");
deansList = false;
academicProbation = true;
break;
default: alert("Grade Error!");
The next aspect of switch to be aware of is that ―fall through‖ actions occur when you omit a
break. You can use this feature to create multiple situations that produce the same result.
Consider a rewrite of the previous example that performs similar actions if the grade is A or B,
as well as D or F:
var yourGrade='B';
var deansList = false;
var academicProbation = false;
switch (yourGrade)
{
case 'A':
case 'B': alert("Pretty good.");
deansList = true;
break;