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Hooks are functions that allow you to use state and other React features without writing a class.
useState is a hook that allows you to add state to functional components.
useEffect is a hook that allows you to perform side effects in functional components.
Hooks can only be used in functional components.
Hooks must be called at the top level of a functional component.
Hooks can be used to replace lifecycle methods in ...
The 'this' keyword in JS refers to the object that is currently executing the code.
The value of 'this' depends on how a function is called.
In a method, 'this' refers to the object that the method belongs to.
In a regular function, 'this' refers to the global object (window in a browser).
In an event handler, 'this' refers to the element that triggered the event.
The value of 'this' can be explicitly set using call(),...
setState is a method used in React to update the state of a component.
setState is asynchronous and batched for performance optimization.
It merges the new state with the previous state.
It schedules a re-render of the component and its children.
Passing a function to setState ensures the previous state is used correctly.
Example: this.setState({ count: this.state.count + 1 })
Export types in ReactJS allow components, functions, and variables to be accessed and used in other files.
Exporting a component allows it to be imported and used in other files
Exporting a function allows it to be imported and used in other files
Exporting a variable allows it to be imported and used in other files
ES6 features: Spread Operator, Rest Parameter, Object Destructuring
Spread Operator: allows an iterable to be expanded into individual elements
Rest Parameter: allows a function to accept an indefinite number of arguments as an array
Object Destructuring: allows extracting properties from an object and assigning them to variables
Promises are a way to handle asynchronous operations in JavaScript. Promise.all is used to execute multiple promises concurrently.
Promises represent a value that may not be available yet
They have three states: pending, fulfilled, and rejected
Promise.all takes an array of promises and returns a new promise that resolves when all promises in the array have resolved
If any promise in the array is rejected, the returne...
Answer to a React Developer interview question about class and functional components and passing props.
Class component: class MyComponent extends React.Component {}
Functional component: const MyComponent = (props) => {}
Passing props from parent to child:
I applied via Naukri.com and was interviewed in Mar 2021. There was 1 interview round.
Export types in ReactJS allow components, functions, and variables to be accessed and used in other files.
Exporting a component allows it to be imported and used in other files
Exporting a function allows it to be imported and used in other files
Exporting a variable allows it to be imported and used in other files
Hooks are functions that allow you to use state and other React features without writing a class.
useState is a hook that allows you to add state to functional components.
useEffect is a hook that allows you to perform side effects in functional components.
Hooks can only be used in functional components.
Hooks must be called at the top level of a functional component.
Hooks can be used to replace lifecycle methods in class...
The 'this' keyword in JS refers to the object that is currently executing the code.
The value of 'this' depends on how a function is called.
In a method, 'this' refers to the object that the method belongs to.
In a regular function, 'this' refers to the global object (window in a browser).
In an event handler, 'this' refers to the element that triggered the event.
The value of 'this' can be explicitly set using call(), appl...
setState is a method used in React to update the state of a component.
setState is asynchronous and batched for performance optimization.
It merges the new state with the previous state.
It schedules a re-render of the component and its children.
Passing a function to setState ensures the previous state is used correctly.
Example: this.setState({ count: this.state.count + 1 })
Answer to a React Developer interview question about class and functional components and passing props.
Class component: class MyComponent extends React.Component {}
Functional component: const MyComponent = (props) => {}
Passing props from parent to child:
Promises are a way to handle asynchronous operations in JavaScript. Promise.all is used to execute multiple promises concurrently.
Promises represent a value that may not be available yet
They have three states: pending, fulfilled, and rejected
Promise.all takes an array of promises and returns a new promise that resolves when all promises in the array have resolved
If any promise in the array is rejected, the returned pro...
ES6 features: Spread Operator, Rest Parameter, Object Destructuring
Spread Operator: allows an iterable to be expanded into individual elements
Rest Parameter: allows a function to accept an indefinite number of arguments as an array
Object Destructuring: allows extracting properties from an object and assigning them to variables
Top trending discussions
I applied via Company Website and was interviewed before Jun 2021. There were 2 interview rounds.
First round was coding as well as aptitude done together went well I guess focusing on codes helps a lot.
I applied via Campus Placement and was interviewed in Apr 2020. There was 1 interview round.
Yes, I am open to relocating for the right opportunity that aligns with my career goals and personal growth.
Relocation can provide exposure to new technologies and methodologies.
I am excited about the prospect of working in diverse teams and cultures.
For example, moving to a tech hub like San Francisco could enhance my career.
I understand the challenges of relocating, but I see them as opportunities for growth.
I bring a unique blend of skills, experience, and passion for software development that aligns perfectly with your team's goals.
Proven experience in developing scalable applications, such as a recent project where I improved performance by 30%.
Strong problem-solving skills demonstrated through my contributions to open-source projects, enhancing functionality and fixing bugs.
Excellent teamwork and communication abilitie...
I applied via Walk-in and was interviewed before Dec 2020. There were 3 interview rounds.
A Fibonacci program generates a sequence where each number is the sum of the two preceding ones, starting from 0 and 1.
The Fibonacci sequence starts with 0 and 1.
Each subsequent number is the sum of the previous two: 0, 1, 1, 2, 3, 5, 8, 13, ...
Common implementations include recursive, iterative, and using dynamic programming.
Example of an iterative approach in Python: ```python def fibonacci(n): a, b = 0, 1 ...
I applied via LinkedIn and was interviewed before Jul 2021. There were 2 interview rounds.
Easy logical questions
basic quant
Easy level coding questions
Counting frequency of alphabets
Multiple dispatch is not a feature of Redux. It can be achieved using middleware or custom logic.
Middleware like redux-thunk or redux-saga can be used to dispatch multiple actions based on a single action.
Custom logic can be implemented in the reducer to handle multiple actions based on a single action type.
For example, a single 'ADD_ITEM' action can trigger multiple actions like 'UPDATE_TOTAL', 'UPDATE_HISTORY', etc.
M...
I applied via Campus Placement and was interviewed before Jun 2020. There were 3 interview rounds.
I applied via Naukri.com and was interviewed before Oct 2019. There were 3 interview rounds.
Faced various technical challenges, including system integration and performance optimization, which I successfully navigated through strategic solutions.
Integration of legacy systems with modern applications: I utilized APIs and middleware to ensure seamless data flow.
Performance bottlenecks in a web application: Implemented caching strategies and optimized database queries, resulting in a 40% speed increase.
Debugging...
I applied via Walk-in and was interviewed before Sep 2019. There were 3 interview rounds.
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