ReferenceError
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The ReferenceError
object represents an error when a variable that doesn't exist (or hasn't yet been initialized) in the current scope is referenced.
ReferenceError
is a serializable object, so it can be cloned with structuredClone()
or copied between Workers using postMessage()
.
ReferenceError
is a subclass of Error
.
Constructor
ReferenceError()
-
Creates a new
ReferenceError
object.
Instance properties
Also inherits instance properties from its parent Error
.
These properties are defined on ReferenceError.prototype
and shared by all ReferenceError
instances.
ReferenceError.prototype.constructor
-
The constructor function that created the instance object. For
ReferenceError
instances, the initial value is theReferenceError
constructor. ReferenceError.prototype.name
-
Represents the name for the type of error. For
ReferenceError.prototype.name
, the initial value is"ReferenceError"
.
Instance methods
Inherits instance methods from its parent Error
.
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
Specification |
---|
ECMAScript Language Specification # sec-native-error-types-used-in-this-standard-referenceerror |
Browser compatibility
BCD tables only load in the browser