HCL Group Senior Technical Lead Interview Questions and Answers

Virtual DOM is a lightweight copy of the actual DOM in memory, used for efficient updates and rendering in web development.

• Virtual DOM is a concept used in frameworks like React to improve performance by minimizing actual DOM manipulations.

• When changes are made to the UI, the Virtual DOM is updated instead of the actual DOM.

• The Virtual DOM is then compared to the actual DOM, and only the differences are applied to the ...read more

Browser interprets JSX by transforming it into regular JavaScript using a transpiler like Babel.

• JSX is not directly understood by browsers, so it needs to be transpiled into regular JavaScript

• Babel is a popular transpiler used to convert JSX into JavaScript

• The transpiled JavaScript code is then executed by the browser

Data skewness refers to the imbalance in the distribution of data values within a dataset.

• Data skewness occurs when certain values or categories appear more frequently than others in a dataset.

• It can lead to performance issues in data processing and analysis.

• To resolve data skewness, techniques like data partitioning, shuffling, and using appropriate algorithms can be employed.

• For example, in a dataset of customer tran...read more

The output of the query will depend on the specific data in the tables being joined.

• The result will be a combination of data from all 4 tables based on the join conditions specified in the query.

• Make sure to check for any filtering conditions in the query that may limit the output.

• The final result will include columns from all 4 tables, with rows that meet the join criteria.

Coding is used to create software programs and applications.

• Coding allows us to instruct computers to perform specific tasks.

• It helps in automating processes and solving complex problems.

• Coding enables the development of software that powers various industries.

• It allows for customization and flexibility in creating solutions.

• Coding is essential for creating websites, mobile apps, and software systems.

• Examples: Writing ...read more

I have used code in various projects and industries, including finance, e-commerce, and healthcare.

• Finance: Developed trading algorithms and risk management systems.

• E-commerce: Built online shopping platforms and payment gateways.

• Healthcare: Created electronic medical record systems and medical imaging software.

Yes, I am okay with CTC not being an issue as long as we are leading in the global market.

• I prioritize being part of a successful and globally competitive company over CTC.

• I believe in the importance of contributing to a company's growth and success.

• I am motivated by the opportunity to work on challenging projects and make a significant impact.

• I value the recognition and reputation that comes with being part of a leadi...read more