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React Interview Questions
3,478 react interview questions shared by candidates
Create a React component that iterates through an array of images, displaying one image at a time. After a 2-second interval, the component should transition to the next image, continuing this cycle. Upon reaching the end of the image array, it should seamlessly loop back to the first image, maintaining the continuous cycle.
Was asked features of Java 9 ..?
Explain the logic behind the Binary Search and write a JavaScript program illustrating the same.
what is virtual dom how to increase performance what is useeffct hook
HTML, CSS, JS, ReactJS,Redux, web workers, service workers, web storage, RTL, RWD, Caching Strategies, Typescript, web pack
1. Versions of React you have worked on and features of latest React version you have worked with? 2. All the hooks that you have used. Explain when to use useCallback. 3. How to manage state in React? 4. Custom hooks. Why use it? 5. What CSS preprocessors you have worked on? 6. Redux related questions. 7. Use of effects in Saga middleware. 8. Which library have you used for testing? Some basic questions. 9. Positions in CSS 10. Grid vs Flex 11. Semantic elements 12. JS questions ---------------- var a = [] function test(b) { a.push(b) return b } var a = [1,2,3] var b = a b.push(4) console.log(a) ---------------- let i; for (i = 0; i < 3; i++) { const log = () => { console.log(i); } setTimeout(log, 100); } ---------------------- var obj = { a: “John”, fun1: function () { console.log(this) } } obj.fun1() ----------------- var obj = { a: “John”, fun1: () => { console.log(this) } } obj.fun1() -------------------- 13. Create a timer/stopwatch using react.
What is generator function? What is reconciliation process.
Some of the question are what is header classes, immediate invoke function, inline cache, linking. execution context.
Q1: WAP to convert variable name from camelCase to snake_case and vice-versa. Q2: WAP to print the occurence of character in string like- Input: 'adbcaabd' Output: 'a3b2c1d2'
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