FIS Interview Questions and Answers

var, let, and const are used to declare variables in JavaScript with different scopes and mutability.

• var is function-scoped and can be redeclared and updated

• let is block-scoped and can be updated but not redeclared

• const is block-scoped and cannot be updated or redeclared

Use a Set to remove duplicate numbers from an array of strings.

• Create a Set from the array to automatically remove duplicates

• Convert the Set back to an array if needed

OOP stands for Object-Oriented Programming. It is a programming paradigm that uses objects to represent and manipulate data.

• OOP focuses on creating reusable code by organizing data and behavior into objects.

• Objects have properties (attributes) and methods (functions) that can be accessed and manipulated.

• Inheritance allows objects to inherit properties and methods from parent objects.

• Polymorphism allows objects to take on multiple forms and behave differently depending on the ...read more

An exception is an unexpected event that occurs during program execution, while an error is a mistake in the code that prevents it from running.

• Exceptions are handled using try-catch blocks

• Errors are usually detected during compilation or runtime

• Examples of exceptions include null pointer exceptions and arithmetic exceptions

• Examples of errors include syntax errors and logical errors

My project followed the SDLC process to ensure efficient and effective software development.

• The project started with the planning phase where we identified the requirements and goals.

• Next, we moved on to the design phase where we created a detailed design document.

• Then, we entered the development phase where we wrote the code and tested it.

• After that, we moved on to the testing phase where we tested the software for bugs and errors.

• Finally, we entered the maintenance phase wh...read more

Data structures and algorithms are essential for efficient software development.

• Data structures are used to organize and store data in a way that allows for efficient access and manipulation.

• Algorithms are used to solve problems and perform operations on data structures.

• Examples of data structures include arrays, linked lists, trees, and graphs.

• Examples of algorithms include sorting, searching, and graph traversal.

• Understanding data structures and algorithms is crucial for op...read more

SDLC is a process used to develop software from planning to deployment.

• SDLC stands for Software Development Life Cycle

• It includes phases like planning, analysis, design, implementation, testing, and maintenance

• Each phase has its own set of activities and deliverables

• For example, in the planning phase, the project scope and requirements are defined

• In the design phase, the software architecture and user interface are created

• In the implementation phase, the code is written and i...read more