ReferenceError() constructor
The ReferenceError
object represents an error when a non-existent variable is referenced.
Syntax
new ReferenceError() new ReferenceError(message) new ReferenceError(message, fileName) new ReferenceError(message, fileName, lineNumber)
Parameters
-
message
Optional -
Human-readable description of the error.
-
fileName
Optional -
The name of the file containing the code that caused the exception.
-
lineNumber
Optional -
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.fileName) // "Scratchpad/1" console.log(e.lineNumber) // 2 console.log(e.columnNumber) // 6 console.log(e.stack) // "@Scratchpad/2:2:7\n" }
Creating a ReferenceError
try { throw new ReferenceError('Hello', 'someFile.js', 10) } catch (e) { console.log(e instanceof ReferenceError) // true console.log(e.message) // "Hello" console.log(e.name) // "ReferenceError" console.log(e.fileName) // "someFile.js" console.log(e.lineNumber) // 10 console.log(e.columnNumber) // 0 console.log(e.stack) // "@Scratchpad/2:2:9\n" }
Specifications
Browser compatibility
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
ReferenceError |
1 |
12 |
1 |
5.5 |
5 |
1 |
1 |
18 |
4 |
10.1 |
1 |
1.0 |
See also
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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ReferenceError/ReferenceError