Internal Property (Definition)

ECMAScript describes internal methods that are private.


ECMAScript edition - 2

Internal properties are not exposed to the programmer using ECMA-compliant JavaScript. However, some implementations may allow you to view them through a debugging interface. The reserved words suggest that at least some of these internal properties may be made visible at a later stage of the language development.

Run time errors may be generated due to faults in the interpreter logic trying to access internal methods that do not exist.

CallA list of argument valuesThis method executes some code associated with the object via a function call mechanism. Objects that implement this internal method are called functions.
CanPutA property nameReturns a Boolean value indicating whether you can put values into the named property.
ClassnoneA string value describing what kind of object this is.
ConstructA list of argument valuesThis constructs an object and is normally invoked by the new operator. Objects that implement this internal method are called constructors.
DefaultValueA hint valueReturns a default value for the object which should be a primitive value and not an object or a reference to one.
DeleteA property nameRemoves the specified property from the object.
GetA property nameThis method returns the value of the named property.
HasInstanceA valueReturns a Boolean value indicating whether there is an instance. This only applies to Function objects.
HasPropertyA property nameReturns a Boolean value indicating whether that property is available as a member of this object.
MatchA string and an indexTests for a regular expression and returns a match result.
PrototypenoneReturns the prototype of this object.
PutA property name and a valueThis method stores the value in the named property.
ScopenoneA scope chain for the Function object to be executed in.
ValuenoneInternal state information associated with this object.

The table describes the base set of ECMA-compliant internal properties. Hosted implementations may add to these and implement special properties in any way they need to. Host implementations may not implement all of these properties.

Every object must implement the Class property.

The value of the Prototype property must be either an object or null. Every prototype chain must have finite length, that is to say starting from any object, traversing the prototype chain must ultimately yield a null value. Whether or not a native object can refer to a host object as its prototype is implementation dependant.

ECMA edition 3 introduces the following internal methods/properties:

See also:Class, class, Internal Method, Object, prototype property, Value property


ECMA 262 edition 2 - section - 8.6.2

ECMA 262 edition 3 - section - 8.6.2