NeoSOFT React Js Software Engineer Interview Questions, Process, and Tips

Q1. Difference between callback, promises and async await?
Ans. 
Callbacks are functions passed as arguments, promises represent eventual completion of an asynchronous operation, async await is syntactic sugar for promises.
• Callbacks are functions passed as arguments to be executed after a certain task is completed.

• Promises represent the eventual completion of an asynchronous operation and allow chaining of multiple asynchronous operations.

• Async await is syntactic sugar for promises,...read more
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Q2. Explain the life cycle of react?
Ans. 
React has three main phases in its life cycle: Mounting, Updating, and Unmounting.
• Mounting: Component is created and inserted into the DOM.

• Updating: Component is re-rendered when props or state change.

• Unmounting: Component is removed from the DOM.
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Q1. JavaScript callback?
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Q2. What is useState?
Ans. 
useState is a hook in React that allows functional components to have state.
• useState is a built-in hook in React.

• It allows functional components to have state.

• It returns an array with two elements: the current state value and a function to update the state.

• The initial state can be passed as an argument to useState.

• The state can be of any data type, such as a string, number, boolean, or object.

• Example: const [count, set
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Q3. What is closure in JavaScript?
Ans. 
Closure is a feature in JavaScript that allows a function to access variables from its outer scope even after the function has finished executing.
• Closure is created when a function is defined inside another function.

• The inner function has access to the variables and parameters of the outer function.

• The inner function forms a closure with the outer function, preserving the state of the outer function's variables.

• Closure...read more
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Q4. JavaScript promise?
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Q5. What are props in react?
Ans. 
Props are read-only properties that are passed from a parent component to a child component in React.
• Props allow data to be passed between components in a unidirectional flow.

• Props are immutable and cannot be modified by the child component.

• Props can be used to customize the behavior or appearance of a component.

• Props are accessed using the 'this.props' syntax in class components or as function arguments in functional
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It was an online test. The test was having 25 English questions and 25 coding MCQ questions. Test duration was 60 Mins

Q1. The first part of the interview contained questions related to my work experience.
Ans. I told the interviewer about what I had done in my past roles.
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Q2. After this interviewer gave me a Machine coding round kind of question. I had to display a list of products using the flexbox layout. Also, I had to create a sort button to sort the list and update the vie...read more
Ans. I used useState hook to capture product details. and updated the list using the sort function.
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Started with a normal assignment. A basic form application with few operation

Q1. Javascript basics and React native
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Q2. Closures,let var and const
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Q3. Threads of javascript, Architecture
Ans. 
Threads of javascript refer to the concept of asynchronous programming in JavaScript. Architecture in this context likely refers to the overall structure and organization of a React Native application.
• JavaScript is single-threaded, meaning it can only execute one piece of code at a time. Asynchronous programming allows for non-blocking operations, improving performance and user experience.

• React Native architecture typi...read more
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Q4. Storage, Secure storage, Offline app handling
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Q5. Push notification, Camera, geomaps
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Q1. Objective javascript questions
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Q1. Delete duplicate element from array
Ans. 
Remove duplicate elements from an array of strings
• Create a new Set from the array to remove duplicates

• Convert the Set back to an array using the spread operator

• Alternatively, use filter() and indexOf() to remove duplicates
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Q1. About you family etc.
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Q1. What About hooks
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Q2. Hooks, Functional Components,
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Duration was 1 hr and topics were css html react js vs code IDE it was a good experience

Q1. Basically javaacript concepts focused
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