BUSINESSNEXT Reactjs Developer Interview Questions, Process, and Tips

React js and JavaScript scenarios based problems.

Q1. All js concepts.
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Q1. What is closures, Hoisting with example Semantic elements
Ans. 
Closures and hoisting are important concepts in JavaScript.
• Closures refer to the ability of a function to access variables in its outer scope even after the function has returned.

• Hoisting is the behavior of moving variable and function declarations to the top of their respective scopes.

• Example of closures: function outer() { let x = 10; function inner() { console.log(x); } return inner; } const innerFunc = outer(); inn...read more
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Q2. Chaining Methods Currying Call bind and apply Optimization of application Server side rendering
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Q3. Selectors HTML 5 features
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Q1. What is a single page appliction?
Ans. 
A single page application is a web application that loads once and dynamically updates the content without refreshing the page.
• Loads once and dynamically updates content

• No page refreshes

• Uses JavaScript frameworks like React to handle routing and rendering

• Improves user experience by providing a seamless and responsive interface
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Q2. What are the advantages of react?
Ans. 
React provides efficient and flexible UI rendering, component reusability, and easy integration with other libraries.
• Virtual DOM allows for faster rendering and improved performance

• Component-based architecture promotes reusability and modularity

• Easy integration with other libraries and frameworks like Redux and React Native

• JSX syntax allows for easy creation of complex UI components

• React community provides a vast array
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Q3. What is useMemo and its usecases
Ans. 
useMemo is a hook in React that memoizes the result of a function and returns the cached value on subsequent renders.
• useMemo is used to optimize performance by avoiding unnecessary re-renders.

• It takes two arguments: a function and an array of dependencies.

• The function is only re-executed if any of the dependencies change.

• Common use cases include expensive calculations, filtering, and sorting.

• Example: useMemo(() => calc
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Q4. What are functional components
Ans. 
Functional components are a type of React component that are defined as a function rather than a class.
• They are simpler and easier to read than class components.

• They don't have state or lifecycle methods.

• They receive props as an argument and return JSX.

• They are often used for presentational components.

• They can use React hooks to manage state and lifecycle.

• Example: const MyComponent = (props) => { return

  {props.text}
  }
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Q1. Difference between let,var and const
Ans. 
let, var, and const are all used for variable declaration in JavaScript, but they have different scopes and behaviors.
• let has block scope, var has function scope, and const is a constant that cannot be reassigned.

• Using let allows you to declare variables that are limited to the scope of a block statement.

• var variables are hoisted to the top of their function scope.

• const variables must be initialized with a value and ca
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Q1. What is react and tell the advantages of React.
Ans. 
React is a JavaScript library for building user interfaces.
• Component-based architecture for reusability

• Virtual DOM for efficient updates

• One-way data binding for predictable data flow

• Supports server-side rendering for SEO optimization
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Q2. What is callback function? What are hooks?
Ans. 
Callback function is a function passed as an argument to another function to be executed later. Hooks are functions that let you use state and other React features without writing a class.
• Callback function is used to handle asynchronous operations or events in JavaScript.

• Example: setTimeout function takes a callback function as an argument to execute after a specified time.

• Hooks are introduced in React 16.8 to allow fu...read more
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Q3. From CSS - What is box model?
Ans. 
Box model is a fundamental concept in CSS which defines the spacing and dimensions of an element.
• The box model consists of content, padding, border, and margin.

• Content area is where the actual content of the element is displayed.

• Padding is the space between the content and the border.

• Border surrounds the padding and content.

• Margin is the space outside the border, separating the element from other elements.

• Example: div ...read more
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Q1. Can you work in night shift?
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Q2. Salary negotiation and package details.
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Q1. Accept or reject offer letter
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Q2. Confirm joining
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Q1. Basic of react.js and css
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Progress bar in react and remote data fetching

Q1. Ui related questions
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Q1. Asked for preferred location and salary
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