The TypeError()
constructor creates a new error when an operation could not be performed, typically (but not exclusively) when a value is not of the expected type.
Syntax
new TypeError([message[, fileName[, lineNumber]]])
Parameters
message
Optional- Optional. Human-readable description of the error
fileName
Optional- Optional. The name of the file containing the code that caused the exception
lineNumber
Optional- Optional. The line number of the code that caused the exception
Examples
Catching a TypeError
try { null.f() } catch (e) { console.log(e instanceof TypeError) // true console.log(e.message) // "null has no properties" console.log(e.name) // "TypeError" console.log(e.fileName) // "Scratchpad/1" console.log(e.lineNumber) // 2 console.log(e.columnNumber) // 2 console.log(e.stack) // "@Scratchpad/2:2:3\n" }
Creating a TypeError
try { throw new TypeError('Hello', "someFile.js", 10) } catch (e) { console.log(e instanceof TypeError) // true console.log(e.message) // "Hello" console.log(e.name) // "TypeError" 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 (ECMA-262) The definition of 'NativeError constructor' in that specification. |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | Server | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
TypeError() constructor | Chrome Full support 1 | Edge Full support 12 | Firefox Full support 1 | IE Full support 5.5 | Opera Full support 5 | Safari Full support 1 | WebView Android Full support 1 | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support 10.1 | Safari iOS Full support 1 | Samsung Internet Android Full support 1.0 | nodejs Full support 0.1.100 |
Legend
- Full support
- Full support