JavaScript

Exception.io: JavaScript

A collection of custom exception classes written in JavaScript.

Inheritance Hierarchy

Error
└── Exception
    ├── ArgumentException
    ├── InvalidInputException
    ├── NotImplementedException
    ├── NotSupportedException
    ├── NotFoundException
    ├── UnauthenticatedException
    └── UnauthorizedException

Classes

Class Name	Description	Default Message
Exception	The exception that is thrown when an error occurs.	No Description
ArgumentException	The exception that is thrown when one of the arguments provided to a method is not valid.	Invalid Argument
InvalidInputException	The exception that is thrown when one of the input provided to a method is not valid.	Invalid Input
NotImplementedException	The exception that is thrown when a requested method or operation is not implemented.	Not Implemented
NotSupportedException	The exception that is thrown when a requested method or operation is not supported.	Not Supported
NotFoundException	The exception that is thrown when an attempt is made to find something that does not exist.	Not Found
UnauthenticatedException	The exception that is thrown when a requested method or operation requires authentication.	Not Authenticated
UnauthorizedException	The exception that is thrown when the current user is not allowed to perform an attempted operation.	Not Authorized

Usage

Initiate any one of the exception classes.

if (item == null) {
    throw new NotFoundException("Item not found.");
}

Check the type of exception we are dealing with:

var err = new Exception();

err instanceof Exception               // → true
err instanceof Error                   // → true
Exception.prototype.isPrototypeOf(err) // → true
Error.prototype.isPrototypeOf(err)     // → true
err.constructor.name                   // → "Exception"
err.name                               // → "Exception"
err.message                            // → "No description"
err.toString()                         // → "[Exception] No description"
err.stack                              // → prints the stack trace

Handle specific exception types using exception's constructor property:

try {
  foo("valA", "valB");
}
catch (e) {
  if (e instanceof ArgumentException) {
    console.error(e.toString());
  }
  else if (e instanceof InvalidInputException) {
    console.error(e.toString());
  }
  else {
    console.error(e.toString());
  }
}

Supported Platforms

• Web Browsers
• Node.js
• Titanium
• Cordova (formerly PhoneGap)

Creator

• Zeeshan Mian (@zmian)

License

Exception.io is released under the MIT license. See LICENSE for details.