TCS Communications Interview Questions, Process, and Tips

Q1. Java stream api filter function
Ans. 
Java stream API filter function is used to select elements based on a given predicate.
• Use filter() method to apply a predicate to each element in the stream

• Predicate should return true for elements to be included in the resulting stream

• Example: List<String> names = Arrays.asList("Alice", "Bob", "Charlie"); List<String> filteredNames = names.stream().filter(name -> name.startsWith("A")).collect(Collectors
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Q2. Spring boot architecture
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Q1. Where do you see after 3 years?
Ans. 
In 3 years, I see myself as a senior developer leading a team on innovative projects.
• Leading a team on innovative projects

• Senior developer role

• Continuing to learn and grow in my career
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Q2. What are your hobbies?
Ans. 
My hobbies include hiking, photography, and playing the guitar.
• Hiking: I enjoy exploring nature trails and challenging myself with different terrains.

• Photography: I love capturing moments and scenes that inspire me.

• Playing the guitar: I find relaxation and creativity in playing music.
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Q1. What is mapplet
Ans. 
A mapplet is a reusable object in Informatica PowerCenter that contains a set of transformations.
• Mapplets can be used in multiple mappings to perform the same set of transformations.

• They can simplify mapping development by encapsulating common logic.

• Mapplets can have input and output ports to connect with other transformations.
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Q2. What is hive database
Ans. 
Hive is a data warehouse infrastructure built on top of Hadoop for providing data summarization, query, and analysis.
• Hive is used for managing and querying large datasets stored in Hadoop Distributed File System (HDFS).

• It provides a SQL-like interface called HiveQL for querying data.

• Hive organizes data into tables, partitions, and buckets to optimize queries.

• It supports custom MapReduce scripts for complex data process...read more
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Q3. Difference between look up and joiner
Ans. 
Look up is used to retrieve data from a single source, while joiner is used to combine data from multiple sources.
• Look up is used to search for a value in a data source and return a corresponding value from the same row.

• Joiner is used to combine data from two or more sources based on a common key.

• Look up is used for one-to-one mapping, while joiner is used for many-to-one or one-to-many mapping.
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Q4. Explain scd2 logic in informatica
Ans. 
SCD2 logic in Informatica is used to track historical changes in data by creating new records for each change.
• SCD2 stands for Slowly Changing Dimension Type 2

• It involves creating new records for each change in data, while maintaining a link to the previous record

• It typically includes effective start and end dates to track the validity of each record

• SCD2 logic is commonly used in data warehousing to maintain historical
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Q5. Difference between router and filter transformation
Ans. 
Router transformation sends data to multiple targets based on conditions, while filter transformation filters rows based on conditions.
• Router transformation can send data to multiple targets based on conditions

• Filter transformation filters rows based on conditions

• Router transformation can be used to route data to different tables based on certain criteria

• Filter transformation can be used to remove unwanted rows from th
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Q1. Output of console.log(0 || false || "result")
Ans. 
The output will be 'result'
• The logical OR operator (||) returns the first truthy value it encounters

• In this case, '0' is falsy, 'false' is falsy, and 'result' is truthy

• Therefore, the output will be 'result'
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Q2. Why do we need to use useState instead of variable?
Ans. 
useState is used in React functional components to manage state and trigger re-renders.
• useState allows functional components to have stateful logic.

• Using variables directly in functional components does not trigger re-renders.

• useState provides a way to update state and trigger component updates.

• useState preserves the state between re-renders.

• Example: const [count, setCount] = useState(0);
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Explain about globalization