Lloyds Technology Centre Senior Data Engineer Interview Questions and Answers

Q1. What are hooks, event loop usecontext api
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Q2. What is aggregator
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Q1. What is the difference between normal and arrow functions
Ans. 
Arrow functions are more concise and have a lexical 'this' binding compared to normal functions.
• Arrow functions do not have their own 'this' keyword, they inherit it from the parent scope.

• Arrow functions do not have their own 'arguments' object.

• Arrow functions cannot be used as constructors with 'new'.

• Arrow functions are more concise and have implicit return when no curly braces are used.
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Q2. All basic JS Questions to cover Hoisting closure
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Q3. They asked to show me an example using the API call
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Q4. Difference between forEach and Map
Ans. 
forEach is used to iterate over an array and perform a function on each element, while map creates a new array by applying a function to each element.
• forEach does not return a new array, while map does

• forEach does not modify the original array, while map creates a new array

• forEach is used for side effects, while map is used for transformation

• Example: forEach - array.forEach(item => console.log(item)), map - const newAr
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Basic array and vectors DSA questions

Q1. Asked me about my past project and my contribution in it
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Q2. Linux commands and c++ language control
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Q3. Asked me to write last function i wrote and explain what it does
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Q1. Asked me about my past projects and my contribution
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Q2. Checked my work ethics
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Q1. Basic hr questions
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Q2. Salary negotiation
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Q1. Interview questions for java developer
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Q2. How to prepare for interview
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Q1. How to clear this round
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Q2. Technical jr has program round
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Q1. Python basic codes
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Q2. SQL query of aggregate function
Ans. 
SQL query using aggregate functions to perform calculations on a dataset
• Use aggregate functions like SUM, AVG, COUNT, MIN, MAX to perform calculations on a dataset

• Group data using GROUP BY clause to apply aggregate functions on specific groups

• Filter data using HAVING clause after applying aggregate functions
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1 hour 10 mins, MERN Stack, Face to Face. Mongodb, medium DSA Question, callback, eventloop, NodeJS asynchronous working