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
Specification |
---|
ECMAScript Language Specification # sec-nativeerror-constructors |
Browser compatibility
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