The TypeError
object represents an error when an operation could not be performed, typically (but not exclusively) when a value is not of the expected type.
A TypeError
may be thrown when:
- an operand or argument passed to a function is incompatible with the type expected by that operator or function; or
- when attempting to modify a value that cannot be changed; or
- when attempting to use a value in an inappropriate way.
TypeError
is a
, so it can be cloned with
or copied between Workers using
.
TypeError
is a subclass of Error.
Constructor
- TypeError()
- : Creates a new
TypeError
object.
- : Creates a new
Instance properties
Also inherits instance properties from its parent Error.
These properties are defined on TypeError.prototype
and shared by all TypeError
instances.
- TypeError.prototype.constructor
- : The constructor function that created the instance object. For
TypeError
instances, the initial value is the TypeError constructor.
- : The constructor function that created the instance object. For
- TypeError.prototype.name
- : Represents the name for the type of error. For
TypeError.prototype.name
, the initial value is"TypeError"
.
- : Represents the name for the type of error. For
Instance methods
Inherits instance methods from its parent Error.
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.stack); // Stack of the error
}
Creating a TypeError
try {
throw new TypeError("Hello");
} catch (e) {
console.log(e instanceof TypeError); // true
console.log(e.message); // "Hello"
console.log(e.name); // "TypeError"
console.log(e.stack); // Stack of the error
}