Explain how objects in Javascript are created modified and accessed with code snippets

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Explain how objects in Javascript are created, modified, and accessed with code snippets?

Explain how objects in Javascript are created, modified, and accessed with code snippets

By:Rajiv

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Rajiv

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Objects are often created with a new expression, which must include a call to a constructor method. The constructor that is called in the new expression creates the properties that characterize the new object.

� In JavaScript, however, the new operator creates a blank object—that is, one with no properties.

� The following statement creates an object that has no properties: var my_object = new Object();

� In this case, the constructor called is that of Object, which endows the new object with no properties, although it does have access to some inherited methods.

� The variable my_object references the new object. Calls to constructors must include parentheses, even if there are no parameters.

� The properties of an object can be accessed with dot notation, in which the first word is the object name and the second is the property name. Because properties are not variables, they are never declared.

� The number of members of a class in a typical object-oriented language is fixed at compile time. The number of properties in a JavaScript object is dynamic.

� At any time during interpretation, properties can be added to or deleted from an object. A property for an object is created by assigning a value to that property’s name. Consider the following example: var my_car = {make: “Ford”, model: “Contour SVT”};\

� Properties can be accessed in two ways. var prop1 = my_car.make; var prop2 = my_car[“make”]; the variables prop1 and prop2 both have the value “Ford”.

� A property can be deleted with delete, as in the following example: delete my_car.model;

� JavaScript has a loop statement, for-in, that is perfect for listing the properties of an object.


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