Hi, I am working as Frontend/JavaScript developer for the past 5+ years. I've taken multiple interviews. I want to share some questions I used to ask from candidates. Hope it'll be helpful for you guys. Let's dive into it.
JavaScript Questions:
- What is an Event loop?
- What are the various data types that exist in JavaScript?
- Difference between Primitive and non-primitive?
- What are the scopes of a variable in JavaScript?
- What is Hoisting in JS?
- What is the ‘this’ keyword in JavaScript?
- What is ES6/ES7?
- What is Callback in JavaScript?
- What is the difference between var, let, and const?
- What is the difference between splice and slice?
- What is the difference between a map and foreach?
- What is the difference between an arrow function and a normal function?
- What is a generator function?
- What is the difference between cookies, sessions, and local storage?
- What are Closures in JavaScript?
- What is the difference between Document and Window in JavaScript?
- What is the difference between Undefined and Undeclared in JavaScript?
- What is the difference between Call and Apply?
- Difference between “ == “ and “ === “ operators?
- What is NaN property in JavaScript?
- What is the difference between Passed by value and passed by reference?
- What is an Immediately Invoked Function in JavaScript?
- What are Higher Order Functions?
- What is currying in JavaScript?
- How many Types of errors are in JavaScript?
- What is BOM?
- Difference between client-side and server-side?
- What is a spread operator?
- What are promises in JS?
- What is Object Destructuring?
- Difference between Async and Promise?
- What is the role of deferred scripts?
- What is the difference between Event Capturing and Event Bubbling?
- What is the Strict mode in JavaScript?
- What is the difference between filter and find?
- Is JavaScript Case-Sensitive?
- How can you convert an object to an array?
- What Is Garbage Collection in JavaScript?
React Js:
- Differentiate between Real DOM and Virtual DOM.
- What is the significance of keys in React?
- What is the purpose of render() in React?
- What are Props?
- What is a state in React?
- Differentiate between stateful and stateless components.
- What are lifecycle methods in React?
- What is the difference between class and functional components?
- What is an event in React?
- What are Refs in React?
- Explain useEffect in detail?
- What are Higher Order Components(HOC)?
- What are Pure Components?
- What is the significance of keys in React?
- What is JSX?
- What is Redux?
- What are the principles of Redux?
- How can you access value from Redux?
- What is the difference between controlled and uncontrolled components?
- What is the difference between useMemo and useCallback?
- What is the difference between useEffect and useLayoutEffect?
- What is SPA?
- What are custom hooks?
- When to use util or custom hook?
- How do you handle optimization in a large React application?
- What is Context API?
- Explain the concept of a Portal in React?
- How do you handle asynchronous data loading in a React application?
- How do you handle localization in a React application?
- What is the difference between static and dynamic components in React?
- How do you handle server-side rendering in a React application?
- What is PropTypes?
- Explain the concept of Memoization in React?
- Does React have one or two-way binding?
- How do you send data from the child to the parent component?
- Does useEffect triggers when we change by reference?
- How to convert functional components to pure components?
- What is Axios interceptor?
- How to validate forms in React?
- What is unit testing?
- What is JWT?
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