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JavaScript Programmer’s Reference See also: Property JavaScript JScript N IE Opera NES ECMA Notes __parent__ 1.2 + 4.0 + - __proto__ 1.2 + 4.0 + - constructor 1.1 + 3.0 + 3.0 + 4.0 + 3.0 + 2 + - name 5.5 + 5.5 + - prototype 1.1 + 3.0 + 3.0 + 4.0 + 3.0 + 2 + Warning, ReadOnly, DontDelete, DontEnum Method JavaScript JScript N IE Opera NES ECMA Notes assign() 1.1 + 3.0 + Warning, Deprecated eval() 1.1 + 3.0 + 3.0 + 4.0 + 3.0 + 2.0 + Warning, Deprecated hasOwn Property() 1.5 + 5.5 + 6.0 + 5.5 + 3 + - isPrototype Of() 1.5 + 5.5 + 6.0 + 5.5 + 3 + - propertyIs Enumerable() 1.5 + 5.5 + 6.0 + 5.5 + 3 + - toLocale String() 1.5 + 5.5 + 6.0 + 5.5 + 3 + Warning toSource() 1.3 + 3.0 + 4.06 + 4.0 + Warning toString() 1.1 + 3.0 + 3.0 + 4.0 + 3.0 + 2 + - unwatch() 1.2 + 4.0 + 3.0 + Warning valueOf() 1.1 + 3.0 + 3.0 + 4.0 + 3.0 + 2.0 + 2 + - watch() 1.2 + 4.0 + 3.0 + Warning Aggregate type, Array object, Boolean object, Date object, delete, Function object, Math object, Native object, Number object, Object, OBJECT object, Object(), Object(), Object.Class, Object.prototype, String object, userDefined object Cross-references: ECMA 262 edition 2 section 4.2.1 ECMA 262 edition 2 section 4.3.3 ECMA 262 edition 2 section 10.1.5 ECMA 262 edition 2 section 15.2 ECMA 262 edition 3 section 4.2.1 ECMA 262 edition 3 section 4.3.3 1576

O Object object (Object/core) This will create a new object of the Stringtype. You can invoke the constructor without the new operator but the consequences will depend on the constructor as to what it will yield as a result. In the case of the Stringdata type, the constructor could be invoked like this: String(”Some Text”); However, you would get a primitive string as a result from this and not a String object. JavaScript is somewhat forgiving and you may not notice this happening until later on when it becomes important that you have a String object and not a simple string. Because this object is the topmost parent object in the prototype inheritance hierarchy, all other object classes inherit its methods and properties. However, in some cases they will get overridden or nulled out. DOM level 2 adds the following properties: contentDocument Although JavaScript is object-based, it does not support true object-oriented classes such as the ones you find in C++, Smalltalk, Java or Objective C. Instead, it provides Constructor mechanisms, which create objects by allocating space for them in memory and assigning initial values to their properties. All functions, including constructors are themselves objects; however, not all objects are constructors. Each constructor has a Prototype property that is used to facilitate inheritance based on the prototype. It also provides for shared properties, which is similar to but not the same as the Class properties that you find in true object-oriented languages. Externally, the objects in JavaScript exhibit most of the attributes of a class based object oriented system and some commentators argue that this qualifies JavaScript as being a genuine object oriented system. However I think the following points declassify it as a truly object oriented system, meaning that it is an “object like” system: . Global variables and the scope chain mechanism . Prototype based inheritance . Creation of multiple objects and calling them within a single script . Object data is not truly private It s a close enough call that JavaScript 2.0 may well move it into the class-based object-oriented category at which time the prototype inheritance would be replaced with super-class/sub-class mechanisms and the arguments become null and void. Warnings: . Be very careful not to confuse this generic top-level core object with the object that MSIE instantiates to represent an