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Rumela S.
Masters of Science, Computer Science
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Web Development
TutorMe
Question:

What are the essential components of web development ?

Rumela S.
Answer:

As a web developer, everything should be taken care of starting from HTML for structure of web page, CSS for styling your web page, JavaScript and similar technologies for form validations, SQL or likewise database technology for database operations, PHP for server side scripting. Other than these other technologies like AJAX for page refreshes, XML/JSON for understanding structure of html documents should also be considered.

PHP Programming
TutorMe
Question:

What is the difference between $var and $$var in PHP ?

Rumela S.
Answer:

The first syntax $var is used for variable declaration whereas the second declaration takes whatever is assigned to the first variable and stores the value of what is assigned to it. For Eg ; $var = 'Weekday'; $$Weekday = 'Monday';

Javascript Programming
TutorMe
Question:

How is the concept inheritance supported in JavaScript despite the fact that it does not support class implementation like most object-oriented languages like Java, C++ ?

Rumela S.
Answer:

Everything in JavaScript is treated as objects. This concept aids in having just one construct called object to provide the implementation of inheritance. It does so through a prototype chain. A prototype of an object can be thought of as its parent which in turn has a prototype and so on. until the top of the chain. When a developer tries to access the property of an object not just the property of the object will be sought but also the property of the prototype will be sought. This propagates through the chain thereby making inheritance possible. The same concept acts in case of methods too. Since JavaScript does not provide an implementation of method in classes so any function can be added as a property. This property can then be accessed through the prototype chain using objects.

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