Web Design Interview Questions and Answers
Question - 91 : - How is type conversion handled in JavaScript?
Answer - 91 : -
JavaScript supports automatic type conversion. Since it is weakly typed, you can pass a function as an argument into another function easily.
This ensures that there are no errors or data type-associated warnings as values get converted to the required data type automatically.
Question - 92 : - How are comments used in JavaScript?
Answer - 92 : -
JavaScript supports two types of comment insertion in the code. Single-line comments and multi-line comments.
Single-line comment: “//” is used for single-line comment insertion
Example:
//This is a single-line comment
Multi-line comment: “/* */” is used to add multi-line comments
Example:
/* This
is a
multi-line
comment*/
Question - 93 : - What are undefined and undeclared variables in JavaScript?
Answer - 93 : -
Variables that have been declared already but not initialized are known as undefined variables.
On the other hand, if a variable is being used in a program without being declared, then it is considered an undeclared variable.
Consider the following example:
var undefVar;
alert(undefVar); // undefined variable
alert(notDeclared); // accessing an undeclared variable
Question - 94 : - What is the result if a jQuery Event Handler returns false?
Answer - 94 : -
If the jQuery Event Handler returns a boolean false value, it simply means that the event will not execute further and will halt the execution for the particular action it is associated with.
Question - 95 : - What is the use of the each() function in jQuery?
Answer - 95 : -
The each() function in jQuery is used to iterate over a set of elements. A function can be passed to each() method. This will result in the execution of each of the events for which the object has been called.
Question - 96 : - What is Pair Programming?
Answer - 96 : -
Pair programming is a scenario where you will be working closely with a colleague on the project, and this is done to help solve the problems at hand. If the development scenario is fast-paced, Agile development might not work efficiently. The interviewer asks this question to see whether you can work with other people easily and effectively.
Question - 97 : - What are the advantages of using a Content Delivery Network (CDN) in jQuery?
Answer - 97 : -
CDNs are widely used in jQuery as they offer an ample number of advantages for users.
- CDNs cause a significant reduction in the load for the server.
- They provide large amounts of savings in the bandwidth.
- jQuery frameworks load faster due to optimizations.
- CDNs have a caching ability that adds to quicker load times.