JS Switch Case Statement

JavaScript Switch Case Statement

Switch Case statement is used when we have to chose between several individual cases after the evaluation of an expression.

Syntax:

switch (expression)
{
  case v_1: statement_1; break;
  case v_2: statement_2; break;
  case v_3: statement_3; break;                    
   ...
  case v_n: statement_n; break;
  [default: statement_n+1];
}

Switch Case statement evaluates the expression. If the expression value is equal to v_1 then run statement_1.
If the expression value is not equal to v_1, proceed to the next instruction statement_2 until to statement_n.
If the expression value is not equal to any value is going to default instruction statement_n +1.

Example:

<script type="text/javascript">
<!--
var city='New York';
switch (city)
{
  case 'London': document.write("London");
            break;
  case 'Munich': document.write("Munich");
            break;
  case 'New York': document.write(New York");
            break;
  case 'Paris': document.write("Paris");
            break;
  case 'Vancouver': document.write("Vancouver");
            break;
  case 'Melbourne': document.write("Melbourne");
            break;            
  default:  document.write("Other city")
}
//-->
</script>