The ReferenceError() constructor creates ReferenceError objects.

Syntax

new ReferenceError()
new ReferenceError(message)
new ReferenceError(message, options)
new ReferenceError(message, fileName)
new ReferenceError(message, fileName, lineNumber)

ReferenceError()
ReferenceError(message)
ReferenceError(message, options)
ReferenceError(message, fileName)
ReferenceError(message, fileName, lineNumber)

Note: ReferenceError() can be called with or without new. Both create a new ReferenceError instance.

Parameters

• message

  • : Human-readable description of the error.

• options

  • : An object that has the following properties:

    • cause

      • : A property indicating the specific cause of the error. When catching and re-throwing an error with a more-specific or useful error message, this property can be used to pass the original error.

• fileName

  • : The name of the file containing the code that caused the exception.

• lineNumber

  • : The line number of the code that caused the exception

Examples

Catching a ReferenceError

try {
  let a = undefinedVariable;
} catch (e) {
  console.log(e instanceof ReferenceError); // true
  console.log(e.message); // "undefinedVariable is not defined"
  console.log(e.name); // "ReferenceError"
  console.log(e.stack); // Stack of the error
}

Creating a ReferenceError

try {
  throw new ReferenceError("Hello");
} catch (e) {
  console.log(e instanceof ReferenceError); // true
  console.log(e.message); // "Hello"
  console.log(e.name); // "ReferenceError"
  console.log(e.stack); // Stack of the error
}

Specifications

Browser compatibility

See also

• Error