Comcast Software Engineer Intern Interview Questions and Answers

Q1. What is functional testing
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Q2. What is agile process
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Q1. Multithreading and Concurrency
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Q1. What is the use of ref?
Ans. 
The 'ref' keyword in C# is used to pass arguments by reference instead of by value.
• Allows a method to modify the value of the argument passed to it

• Useful when you want to update the original value of a variable inside a method

• Can be used with value types and reference types

• Example: void UpdateValue(ref int num) { num = 10; }

• Example: int value = 5; UpdateValue(ref value); // value will be 10 after the method call
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Q2. What are React Hooks
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React Hooks are functions that let you use state and other React features without writing a class.
• React Hooks were introduced in React 16.8.

• They allow you to use state and other React features in functional components.

• Some commonly used React Hooks are useState, useEffect, useContext, etc.

• Hooks are more lightweight and easier to understand compared to class components.
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Q1. Project discussion
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Q2. Hooks concept questions
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Generale questions about my previous experience

Q1. Leetcode problem solving
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Q2. Leetcode problem solving 2
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Nodejs assignment was given

Q1. C# abstraction and encapsulation
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Q2. Reflection and indexers in c#
Ans. 
Reflection and indexers in C#
• Reflection allows inspecting and manipulating metadata of types, objects, and assemblies at runtime

• Indexers provide a way to access elements of a class or struct using array-like syntax

• Reflection can be used to dynamically access and invoke indexers
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Q3. Difference between ienumerable and iqueryable
Ans. 
IEnumerable is read-only and forward-only while IQueryable is queryable and can be filtered.
• IEnumerable is used for in-memory collections while IQueryable is used for querying databases.

• IQueryable is more efficient for large datasets as it allows for server-side filtering.

• IQueryable extends IEnumerable and adds additional functionality for querying data sources.

• Example: IEnumerable numbers = new List { 1, 2, 3 }; IQuer...read more
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Q4. Difference between rank and dense rank in c#
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Rank assigns unique numbers to each distinct value, while dense rank assigns consecutive numbers to each distinct value.
• Rank and DenseRank are used to assign a unique number to each distinct value in a sorted list.

• Rank assigns a unique number to each distinct value, but leaves gaps for ties.

• DenseRank assigns consecutive numbers to each distinct value, without leaving gaps for ties.

• In C#, Rank and DenseRank are availabl...read more
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Q5. Difference between function and Stored procedure
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Q6. Difference between clustered and non clustered index
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Clustered index determines the physical order of data in a table, while non-clustered index has a separate structure.
• Clustered index sorts and stores the data rows in the table based on their key values, while non-clustered index has a separate structure that contains the key values and a pointer to the data row.

• A table can have only one clustered index, while it can have multiple non-clustered indexes.

• Clustered index ...read more
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Q7. Difference between execute scalar and execute nonquery
Ans. 
ExecuteScalar returns single value while ExecuteNonQuery does not return any value.
• ExecuteScalar is used for retrieving a single value from the database, such as a count or sum.

• ExecuteNonQuery is used for executing SQL statements that do not return any value, such as INSERT, UPDATE, DELETE.

• ExecuteScalar returns the first column of the first row of the result set, while ExecuteNonQuery returns the number of rows affecte...read more
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Q1. What is my name
Ans. 
The question is asking for your name.
• Answer with your actual name

• Be honest and straightforward

• Avoid giving a fake name or trying to be clever
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Q2. Salry how much exoected
Ans. 
I expect a salary that reflects my skills, experience, and the industry standards for this role.
• Research industry standards: For example, Glassdoor or Payscale can provide insights into average salaries for similar roles.

• Consider your experience: If you have 5+ years in software development, you might expect a higher salary than entry-level positions.

• Location matters: Salaries can vary significantly based on the cost o...read more
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Q1. Salary how mych
Ans. 
Discussing salary expectations is crucial for aligning job offers with personal financial goals and market standards.
• Research industry standards: Use websites like Glassdoor or Payscale to find average salaries for similar roles.

• Consider your experience: If you have 5+ years in software development, you might expect a higher salary than entry-level positions.

• Location matters: Salaries can vary significantly based on ge...read more
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Basic LIS problem. Coded using Java. Asked to improve it using collections.

Q1. Explain current project and what you have handled
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Q2. Longest substring problem
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