Switch Statement

Conditional statements are used to perform different actions based on different conditions.

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The JavaScript Switch Statement

Use the switch statement to select one of many blocks of code to be executed.

Syntax

switch(n) { case 1:   execute code block 1   break; case 2:   execute code block 2   break; default:   code to be executed if n is different from case 1 and 2 }

This is how it works: First we have a single expression n (most often a variable), that is evaluated once. The value of the expression is then compared with the values for each case in the structure. If there is a match, the block of code associated with that case is executed. Use break to prevent the code from running into the next case automatically.

Example <script type="text/javascript"> //You will receive a different greeting based //on what day it is. Note that Sunday=0, //Monday=1, Tuesday=2, etc. var d=new Date(); var theDay=d.getDay(); switch (theDay) { case 5:   document.write("Finally Friday");   break; case 6:   document.write("Super Saturday");   break; case 0:   document.write("Sleepy Sunday");   break; default:   document.write("I'm looking forward to this weekend!"); } </script>