Tesco Software Developer Interview Questions and Answers

Q1. How indexing works internally?
Ans. 
Indexing in databases is a way to optimize search queries by creating a data structure that allows for faster retrieval of data.
• Indexing creates a data structure (like B-trees or hash tables) that maps keys to the locations of corresponding data entries.

• When a query is made, the database engine uses the index to quickly locate the relevant data entries instead of scanning the entire database.

• Indexes can be created on o...read more
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Q1. Intoduce yourself
Ans. 
I am a passionate software developer with experience in Java, Python, and web development.
• Experienced in Java and Python programming languages

• Proficient in web development technologies such as HTML, CSS, and JavaScript

• Strong problem-solving skills and ability to work in a team environment
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Q2. Your Projects
Ans. 
Developed a web application for tracking personal fitness goals
• Used React.js for front-end development

• Implemented RESTful APIs for data retrieval and storage

• Utilized MongoDB for database management
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Q1. Laravel based questions
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Q1. Basic questions
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Q1. What is garbage collector in python
Ans. 
Garbage collector in Python is a built-in feature that automatically manages memory by reclaiming unused memory space.
• Garbage collector in Python helps in automatically deallocating memory of objects that are no longer in use.

• It prevents memory leaks by freeing up memory that is no longer needed.

• Python's garbage collector uses reference counting and a cycle-detecting algorithm to manage memory efficiently.
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2 coding questions from dsa. one quest was from trees ds

Q1. Why did you choose target
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Q2. Minus points in you that you can share with us
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Q1. Why string arr immutable
Ans. 
String arrays are immutable because they cannot be changed once created.
• Strings in an array cannot be modified individually

• Any changes to a string array result in a new array being created

• Immutable arrays ensure data integrity and prevent unintended side effects
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Q2. How we can create a custom immutable class
Ans. 
To create a custom immutable class, use final keyword for class, private final fields, and no setter methods.
• Use the final keyword for the class to prevent inheritance

• Declare all fields as private and final to prevent modification

• Do not provide setter methods for the fields to maintain immutability

• Provide getter methods to access the fields
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