TypeError() constructor
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- 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 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
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