Confluent SDE (Software Development Engineer) Interview Questions and Answers

Q1. Impliment counter using closure in js
Ans. 
Implement a counter using closure in JavaScript.
• Create a function that returns another function which increments a counter variable.

• The counter variable should be defined in the outer function's scope and only accessible to the inner function.

• Each time the inner function is called, increment the counter variable and return its value.
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Q2. Explain promises, promise.all(), impliment binary search
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Promises are objects representing the eventual completion or failure of an asynchronous operation. promise.all() is a method that takes an array of promises and returns a single promise that resolves when all of the promises have resolved.
• Promises are used in JavaScript to handle asynchronous operations.

• promise.all() takes an array of promises and returns a single promise that resolves when all promises in the array ha...read more
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Q1. Questions on kafka, cache invalidation, diff b/w authentication and authorization
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2 dsa questions of easy/medium

Q1. Asked two dsa questions of leetcodeeasy/medium
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Q1. Asked two dsa questions of leetcode easy/medium
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Q1. Asked one dsa question on tree and discussion on resume and dbms os
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Q1. Salary Discussion
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Object oriented programming questions

React native component build pagination

Q1. Basics of profile
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Q2. Basics of profile one
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Some database questions,some java questions .

Q1. What is the difference between javascript and jQuery.
Ans. 
JavaScript is a programming language used for web development, while jQuery is a library built with JavaScript to simplify HTML document traversal and manipulation.
• JavaScript is a programming language, while jQuery is a library written in JavaScript.

• JavaScript can be used for a wide range of tasks, while jQuery is mainly used for DOM manipulation and event handling.

• JavaScript is a core technology for web development, w...read more
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Q2. Define different types of join
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Different types of joins are used in SQL to combine rows from two or more tables based on a related column between them.
• Inner Join: Returns rows when there is at least one match in both tables.

• Left Join (or Left Outer Join): Returns all rows from the left table and the matched rows from the right table.

• Right Join (or Right Outer Join): Returns all rows from the right table and the matched rows from the left table.

• Full ...read more
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Q3. Define multithreading concept and exception handling.
Ans. 
Multithreading allows multiple threads to run concurrently, while exception handling deals with errors in a program.
• Multithreading involves running multiple threads simultaneously to improve performance and responsiveness.

• Threads share the same memory space but have their own program counter and registers.

• Exception handling is a mechanism to handle errors or exceptional situations in a program.

• It helps prevent the prog...read more
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Implement your own state management in React and integrate it into a React application.

Q1. Design pattern experience
Ans. 
I have extensive experience with various design patterns such as Singleton, Factory, Observer, and MVC.
• Implemented Singleton pattern to ensure only one instance of a class exists

• Utilized Factory pattern to create objects without specifying the exact class

• Implemented Observer pattern for event handling and notifications

• Utilized MVC pattern for separating concerns in a software application
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Q1. Past Experience
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