Exceptions

Exceptions are errors that happen while JavaScript is running. JavaScript provides a mechanism to catch these errors when they happen.

try...catch...finally Statment

The try...catch...finally statement allows for testing of a block of code for exceptions (errors).

The try block contains the code to be run, the catch block contains the code to be executed if an error occurs, and the optional finally block contains code that is run regardless of errors.

The try...catch...finally statement has the following syntax:

try
{
  // Put an code that may
  // produce errors here
}
catch(exception)
{
  // Handle errors here. The
  // exception object contains
  // information about the error
  console.log(exception);
}
finally
{
  // This code always runs
  // regardless of whether an
  // error occurred
}

throw Statement

The throw statement allows for the creation of an exception.

The throw statement is normally used in conjunction with the try...catch statement to control program flow and accurately handle errors.

The throw statement has the following syntax:

throw(exception)

The exception can be a string, integer, Boolean, or an object.