24.184. TypeError: thrown when a value is of the wrong type
ECMAScript v3: Object
Error
TypeError
24.184.1. Constructor
new TypeError( )
new TypeError(
message
)
24.184.1.1. Arguments
-
message
-
An optional error message that provides details about the exception. If specified, this argument is used as the value for the
message
property of the TypeError object.
24.184.1.2. Returns
A newly
constructed
TypeError object. If the
message
argument is specified, the Error object uses it as the value of its
message
property;
otherwise
, it uses an implementation-defined default string as the value of that property. When the
TypeError( )
constructor is called as a function, without the
new
operator, it behaves just as it does when called with the
new
operator.
24.184.2. Properties
-
message
-
An error message that provides details about the exception. This property holds the string passed to the constructor, or an implementation-defined default string. See
Error.message
for details.
-
name
-
A string that specifies the type of the exception. All TypeError objects inherit the value "TypeError" for this property.
24.184.3. Description
An instance of the TypeError class is thrown when a value is not of the type expected. This happens most often when you attempt to access a property of a
null
or
undefined
value. It can also occur if you invoke a method defined by one class on an object that is an instance of some other class, or if you use the
new
operator with a value that is not a constructor function, for example. JavaScript
implementations
are also permitted to throw TypeError objects when a built-in function or method is called with more arguments than expected. See
Error
for details about throwing and catching exceptions.
24.184.4. See Also
Error
,
Error.message
,
Error.name
|
