What is react , advantage and limitation also asked javascript coding question for removing duplicate number of array.
React Developer Interview Questions
3,483 react developer interview questions shared by candidates
Most of the questions are related to how nodejs and javascript work, e.g Callstack, Threading, Difference between NodeJs and Browser
Diff btwn functional and class based component, how can we replicate lifecycle method in functional , component, js questions like closure, hoisting, let var, const , coding question to remove duplicates from given , also asked me to create a react form with validation , intrview duration 45 mins .
Task was to "... take a component designed in Figma and translate this into a functional component in React"
Javascript logical questions with console outputs
Questions on redux, react,javascript.There were also some syntax related questions.
Round 1: Frontend (Machine Coding - React) The interviewer asked me to develop a file system in React. It was a machine coding round, and the interviewer was quite impressed with my solution. Round 2: Backend (System Design & JavaScript) This round focused on backend concepts. The interviewer asked: "What is the use of an API Gateway?" "Implement Promise.race() in JavaScript." A simple DSA question related to flight management (very easy level). "What is the purpose of CORS errors, and why don’t we get them in Postman?" Round 3: Java & Spring Boot This round tested my knowledge of Java and Spring Boot: "Why is dependency injection needed, and what is its purpose?" A simple DSA question: "Return the K greatest numbers from an array." "What are different HTTP status codes, and when are they used?" Round 4: Advanced Frontend (Rejection Round) Since I mentioned being strong in frontend, they gave me a challenging task: Implement API retries: If an API call fails, retry it 3 times with a 1-second delay. (My solution wasn’t perfect.) Build a product listing page with: Pagination Filtering Search functionality (by product name) Good CSS styling Time given: 40 minutes (I managed pagination and sorting but had bugs. Realistically, this would take 50-60 minutes in React.) Round 5: Project Deep Dive & Problem-Solving (Formality Round) This was more of a discussion round: Explained my project implementation in detail. "How is a HashSet implemented in Java?" Puzzle: "You have two ropes, each taking 30 minutes to burn. How do you measure exactly 45 minutes? (You can’t bend them or measure half accurately.)" My answer: Burn one rope from one end (30 mins) and the other from both ends (15 mins). Total = 45 mins. The interviewer was satisfied. They deep-dived into my projects to assess my understanding.
Some questions related to Typescript utility types.
Find errors in code snippets they shared
Optimization in React Application, RTK, JS Questions
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