200+ Interview Questions and Answers

SSR in React JS refers to Server-Side Rendering, where the initial HTML is generated on the server before being sent to the client.

• SSR helps improve SEO by providing search engines with fully rendered pages.

• It can also improve performance by reducing the time to first paint and time to interactive.

• SSR can be implemented using libraries like Next.js or Gatsby.

• Example: Next.js allows for easy SSR implementation by simply exporting a function called getServerSideProps.

Java 8 introduced several new features including lambda expressions, functional interfaces, streams, and default methods.

• Lambda expressions allow for more concise code and easier parallel programming.

• Functional interfaces enable the use of lambda expressions.

• Streams provide a way to work with collections of objects in a functional style.

• Default methods allow interfaces to have method implementations.

Internal implementations of data structures in application development.

• Data structures like arrays, linked lists, stacks, queues, trees, and graphs are commonly used in application development.

• Implementations can vary based on the specific requirements of the application.

• For example, arrays are often used for storing and accessing data in a linear manner, while trees are used for hierarchical data structures.

Test Strategy defines the overall approach to testing, while Test Plan outlines the specific details of how testing will be conducted.

• Test Strategy is high-level and focuses on goals and objectives, while Test Plan is detailed and outlines specific tasks and timelines.

• Test Strategy is created at the beginning of the project, while Test Plan is created after the Test Strategy is defined.

• Test Strategy is more abstract and does not include specific test cases, while Test Plan in...read more

Delete removes rows from a table, while truncate removes all rows and resets identity seed.

• Delete is a DML command, while truncate is a DDL command.

• Delete can be rolled back, while truncate cannot be rolled back.

• Delete fires triggers, while truncate does not fire triggers.

• Delete is slower as it logs individual row deletions, while truncate is faster as it logs the deallocation of data pages.

Search help is a feature in SAP that provides users with a list of possible values to choose from when entering data in a field.

• Search help can be defined at the field level in the data dictionary

• Different types of search helps include elementary search helps, collective search helps, and collective search helps with check table

• Examples of search helps include F4 help in SAP GUI and value helps in WebDynpro applications

Delta Lake is an open-source storage layer that brings ACID transactions to Apache Spark and big data workloads.

• Delta Lake provides ACID transactions, scalable metadata handling, and unifies streaming and batch data processing.

• It ensures data integrity and reliability by providing schema enforcement and data versioning capabilities.

• Delta Lake is compatible with Apache Spark and supports various data formats like Parquet, ORC, and Avro.

Slicing in Python refers to extracting a portion of a list or string using index ranges.

• Slicing syntax: list[start:end:step]

• Start index is inclusive, end index is exclusive

• Omitting start index defaults to beginning, omitting end index defaults to end

• Negative indices count from the end of the list

• Examples: list[1:4], list[:3], list[2:], list[:-1], list[::-1]

SQL Joins are used to combine rows from two or more tables based on a related column between them.

• Joins are used to retrieve data from multiple tables based on a related column

• Types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

• INNER JOIN returns rows when there is at least one match in both tables

• LEFT JOIN returns all rows from the left table and the matched rows from the right table

• RIGHT JOIN returns all rows from the right table and the matched rows from...read more

Sorting objects involves arranging them in a specific order based on certain criteria.

• Use a sorting algorithm such as bubble sort, selection sort, or merge sort.

• Define a comparison function to determine the order of the objects.

• Consider the properties of the objects that need to be sorted.

• Example: Sorting an array of objects based on a specific property like 'name' or 'age'.