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ReferenceError constructor

In JavaScript you create a ReferenceError instance using the constructor ReferenceError.


Creates a ReferenceError object when trying to dereference a non-existant variable.


Signature Description
anError = new ReferenceError([message]);In JavaScript you create a range error instance using the constructor ReferenceError.


Parameter Description
messageAn optional description of the error.

Class Properties

Class Property Description
prototypeEnables property assignment to objects of type ReferenceError.

Instance Properties

Instance Property Description
constructorReturns a reference to the ReferenceError function that created the prototype.
nameAn error name.

Class Methods


Instance Methods



Let's look at some examples of throwing a reference error within our code.

// Throw an error.
try {
  throw new ReferenceError();
} catch (e) {
    alert('A reference error: ' +;

// Throw an error with a message.
try {
  throw new ReferenceError('Throwing a reference error.');
} catch (e) {
    alert('A reference error with message: ' + + ': ' + e.message);

Press the button below to action the above code:

We can also create our own ReferenceError instances as the example below shows.

// Create our own ReferenceError object.
function ourReferenceError(message) { = 'OurReferenceError';  
  this.message = message || 'Default Message Used When No Message Passed';

// Inherit from the ReferenceError prototype.
ourReferenceError.prototype = new ReferenceError();  
ourReferenceError.prototype.constructor = ourReferenceError;   

// Throw an error.
try {  
  throw new ourReferenceError();  
} catch (e) {  
  alert('Our Error: ' + + ' Message: ' + e.message);

// Throw an error and a message.
try {  
  throw new ourReferenceError('A Message we have passed');  
} catch (e) {  
  alert('Our Error: ' + + ' Our Message: ' + e.message);
} finally {  
  alert('A finally statement will always be executed!');

Press the button below to action the above code:

Related Tutorials

JavaScript Advanced Tutorials - Lesson 2 - Errors


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