Uplers Interview Questions, Process, and Tips

Q1. Can you outline a simple strategy for fallback error handling in a Node.js application using async/await?
Ans. 
Use try-catch blocks to handle errors in async/await functions in Node.js applications.
• Wrap the async function in a try block and catch any errors using a catch block.

• Use the throw keyword to throw custom errors within the async function.

• Handle promise rejections using the catch block of the async/await function.

• Use the finally block to execute cleanup code regardless of whether an error occurred or not.
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Q1. What are design patterns in laravel ?
Ans. 
Design patterns in Laravel are reusable solutions to common problems in software design.
• Design patterns help in organizing code and improving code reusability.

• Some common design patterns in Laravel include Singleton, Factory, Repository, and Observer.

• Singleton pattern ensures that only one instance of a class is created.

• Factory pattern is used to create objects without specifying the exact class of object that will be ...read more
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Q1. What are Facades in laravel?
Ans. 
Facades in Laravel provide a simple and convenient way to access classes and services from the container.
• Facades act as static proxies to underlying classes, allowing easy access to their methods.

• They provide a clean and expressive syntax for accessing services.

• Facades are used to access Laravel's core services, such as the database, cache, and session.

• They can be used to access custom classes and services registered i...read more
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Q1. What are higher order components
Ans. 
Higher order components are functions that take a component and return a new component with additional functionality.
• Higher order components are used for code reuse and logic sharing.

• They allow you to abstract common logic into a reusable component.

• Examples include components that handle authentication, data fetching, or styling.
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Q2. Diff between state amd props
Ans. 
State is mutable and controlled by the component itself, while props are immutable and passed down from parent components.
• State is managed within a component and can be changed using setState() method

• Props are passed down from parent components to child components

• State can be updated and re-render the component, while props are read-only
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Q3. How to pass data from child to parent
Ans. 
Using callback functions or props to pass data from child to parent in React
• Use callback functions to pass data from child to parent

• Pass data as props from child component to parent component

• Utilize state management libraries like Redux to pass data between components
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Q4. UseEffect , useState , useMemo hooks
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Q5. How you will optimize the performance of react application
Ans. 
Optimizing performance of React application involves code splitting, lazy loading, minimizing bundle size, using memoization, and optimizing render methods.
• Implement code splitting to load only necessary code for each route or component.

• Utilize lazy loading to load components only when they are needed.

• Minimize bundle size by removing unnecessary dependencies and using tools like Webpack Bundle Analyzer.

• Use memoization ...read more
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Q6. Explain context Api
Ans. 
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 passing global data like themes, user authentication, etc. to multiple components.

• Context API consists of three main parts: Provide...read more
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Q7. What is meant by props drilling
Ans. 
Props drilling is the process of passing props from a parent component to multiple levels of nested child components.
• Props drilling can lead to a lot of unnecessary passing of props through intermediate components.

• It can make the code harder to maintain and understand.

• One way to avoid props drilling is by using React Context API or Redux for managing global state.
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Q8. What is meant by redux
Ans. 
Redux is a predictable state container for JavaScript apps.
• Redux is a state management library for JavaScript applications.

• It helps in managing the state of the application in a predictable way.

• Redux follows a unidirectional data flow pattern.

• Actions are dispatched to update the state in the store.

• Components can subscribe to the store to get updates.
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Q9. How you implement redux in react js
Ans. 
Redux is implemented in React by creating a store, defining actions, creating reducers, and connecting components.
• Create a Redux store using createStore() function from 'redux' package

• Define actions as plain objects with a 'type' property

• Create reducers to specify how the state changes in response to actions

• Connect components to the Redux store using connect() function from 'react-redux' package
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Q1. Angular concepts, javascript concepts
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Coderbyte - mcqs, 1 string qs, 2 angular qs

Html css question and some aptitude questions.. english also

Q1. What are css version
Ans. 
CSS has different versions like CSS1, CSS2, CSS3, and CSS4.
• CSS1 was released in 1996

• CSS2 was released in 1998

• CSS3 introduced new features like animations, transitions, and media queries

• CSS4 is still in development
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Assessment assignment of making changes in NDA Agreement

Q1. Asked questions about employment law
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Q2. Recent developments in labour law.
Ans. 
Recent developments in labour law include changes in minimum wage laws, gig economy regulations, and remote work policies.
• Increased focus on protecting gig workers' rights

• Expansion of paid leave benefits for employees

• Updates to overtime pay regulations

• Implementation of remote work policies due to COVID-19 pandemic
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