Javascript concepts and techniques
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The document provides an overview of key JavaScript concepts including objects, functions, prototypes, inheritance, closures, namespaces and classes. It discusses JavaScript as a prototype-based language and how concepts like inheritance are simulated rather than being true classes. Code examples are provided to demonstrate various JavaScript programming techniques.
![[object Object],Introduction](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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Editor's Notes
- Hi, welcome everybody. Today let’s discuss about virtualization and how it helps to improve our productivity during day to day software development.
- . How the javascript evolution came to the being of what it is today, we have always designated javascript as a second fiddle language in our programming careers.
- The web becomes interactive and the wall talks back, it powers the web pages which start listening to your needs.
- Javascript sits with HTML abd CSS as one of the three pieces of modern web page construction. One must follow the trail of the structure (HTML), to style (CSS), and then to action (Javascript)
- So we’ve seen ways to create an object, complete with its properties and methods. But if you notice all the snippets above, the properties and methods are hardcoded within the object definition itself. What if you need more control over the object creation? For example, you may need to calculate the values of the object’s properties based on some parameters. Or you may need to initialize the object’s properties to the values that you’ll only have at run time. Or you may need to create more than one instance of the object, which is a very common requirement. In C#, we use classes to instantiate object instances. But JavaScript is different since it doesn’t have classes. Instead, as you’ll see in the next section, you take advantage of the fact that functions act as constructors when used together with the "new" operator.
- The prototype object is a central concept in object-oriented programming with JavaScript. Name comes from the idea that in JavaScript, an object is created as a copy of an existing example (that is, a prototype) object every function has a property named "prototype" that refers to a prototype object prototype object in turn has a property named "constructor," which refers back to the function itself (Confused ??) Code Demo : var buddy = new Dog(“Buddy“);
- Refer to the code in 4Prototype.aspx