JavaScript also allows you to add a "finally" block to the "try-catch" block discussed previously. The "finally" block contains statements that are executed regardless of whether an exception is generated or not in the "try-catch" block.

try {
execute this block
} catch (error) {
execute this block if error
} finally {
execute this block after the try block
}

If an exception is encountered when running the code within the "try" block, JavaScript will stop execution at that point, and look for a "catch" block to handle it. Once the error has been handled (or if no "catch" block exists), control passes to the "finally" block.

Take a look at the next example to see how this works:

<script language="JavaScript">

// ask for user input

  code = prompt("Enter some JavaScript code");
// run the code and catch errors if any generated

  // after the error handling display goodbye message

  try {

  eval(code);

  } catch (e) {

  alert("The following error occurred: " + e.name + " - " 
  + e.message); } finally {

  alert ("Thank you for playing. Come back soon!");

  }
</script> 

Here's the output:

It's important to note that the code in the "finally" block will be executed even if errors are encountered in the corresponding "try" block.