10+ Capgemini Front end Developer Interview Questions and Answers

Life cycle methods are methods that are automatically called at different stages of a component's life cycle in React.

• ComponentDidMount is called after the component has been rendered to the DOM.

• ComponentDidUpdate is called after the component's state or props have been updated.

• ComponentWillUnmount is called before the component is removed from the DOM.

1. Client-side scripting runs on the user's browser, while server-side scripting runs on the server. 2. Destructuring is a way to extract values from objects and arrays. 3. HOC stands for Higher Order Component in React. 4. Combining nested arrays involves flattening them into a single array. 5. Counting vowels in a string involves iterating through the characters and checking if they are vowels.

• Client-side scripting executes on the user's browser, while server-side scripting...read more

Finding missing values in array using JavaScript and incrementing/decrementing count in React.

• Use JavaScript to find missing values in array by comparing with a reference array.

• Implement logic to increment and decrement count in React based on user interactions.

• Example: const array = ['apple', 'banana', 'orange']; const referenceArray = ['apple', 'banana', 'grape'];

• Example: Implement a counter component in React that increments and decrements count based on button clicks.

React is a JavaScript library for building user interfaces.

• React allows for the creation of reusable UI components

• It uses a virtual DOM for efficient rendering

• React is declarative, making it easier to understand and debug code

To call an API and print data in React, use fetch or axios to make the API call and then render the data in the component.

• Use fetch or axios to make the API call in React component

• Store the API response data in state using useState hook

• Render the data in the component using JSX

Agile process involves iterative development, frequent collaboration, and adaptability to changes.

• Daily stand-up meetings to discuss progress and roadblocks

• Sprints for focused development and testing

• Continuous feedback and iteration based on user input

• Use of tools like Jira or Trello for project management

Creating a simple app using Redux for state management in a front end application.

• Set up Redux store with reducers and actions

• Connect components to Redux store using mapStateToProps and mapDispatchToProps

• Dispatch actions to update state in Redux store

• Use combineReducers to manage multiple reducers

Context API is a feature in React that allows sharing data between components without having to pass props through every level of the component tree.

• Context API provides a way to pass data through the component tree without having to pass props down manually at every level.

• It is useful for sharing global data such as themes, user authentication, or language preferences.

• Context API consists of three main parts: Provider, Consumer, and useContext hook.

• Example: const ThemeContex...read more

Redux life cycle involves actions, reducers, store, and state management in a predictable flow.

• Actions are dispatched to trigger state changes

• Reducers specify how the state should change based on the action type

• Store holds the application state

• State is updated immutably