Fuzionest Reactjs Developer Interview Questions and Answers

Q1. Basics of javascript and react concept.
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Asked about vanilla.js in react interview.

Q1. Basic of react.js and css
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Q1. Javascript array methods like filter and reduce. Javascript guess the output questions based on variables and functions.
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Q2. React lifecycle methods
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Q3. UseState and useEffect usecase
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useState manages state, while useEffect handles side effects in functional components.
• useState initializes state: const [count, setCount] = useState(0);

• useEffect runs side effects: useEffect(() => { document.title = `Count: ${count}`; }, [count]);

• useState can hold any data type: const [user, setUser] = useState({ name: '', age: 0 });

• useEffect can mimic lifecycle methods: useEffect(() => { fetchData(); }, []); for...read more
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Q1. What is the difference between states and props ?
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States are mutable data managed within a component, while props are immutable data passed from parent to child components.
• States are managed within a component and can be changed using setState method

• Props are passed from parent to child components and are immutable

• States are used for internal component data management, while props are used for passing data between components

• Example: A counter component may have a stat...read more
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Q2. How are data passed from children to parents in react component?
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Data can be passed from children to parents in React components by using callback functions.
• Use callback functions to pass data from child components to parent components

• Parent component passes a function as a prop to child component

• Child component calls the function with the data as an argument to pass data to parent component
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Q1. First Round is telephonic. Self -introduction, and basics of React js
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Q1. Second round is video interview. life cycle of react js, dom manipulations, HOC, Redux, React memo, props drilling Javascript: array cloning, object cloning, Data types, Nan
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