| 25. 2. 1. The Object Class |
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The Object class in JavaScript is similar to java.lang.Object in Java. |
The Object class in JavaScript is the base class for all JavaScript classes. |
All the properties and methods of the Object class are also present in the other classes. |
The Object class has the following properties: |
- constructor -- For the Object class, this points to the native Object() function.
- prototype -- For the all classes, this returns an instance of Object by default.
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The Object class also has several methods: |
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object.hasOwnProperty(property)
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Determines if a given property exists for the object. |
The property must be specified as a string. |
For example, o.hasOwnProperty("name"). |
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object.isPrototypeOf(object)
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Determines if the object is a prototype of another object. |
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propertyIsEnumerable(property)
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Determines if a given property can be enumerated by using the for...in statement. |
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Returns a primitive string representation of the object. |
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Returns the most appropriate primitive value of this object. |
For many classes, this returns the same value as toString(). |
Each of the properties and methods listed previously are designed to be overridden by other classes. |