Wipro Senior Front end Developer Interview Questions and Answers

Q1. Output questions on JavaScript.(Array, hoisting, event)
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Q2. Questions on React and Redux
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Q1. How are you doing?
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Q2. What do you do in your life?
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Q1. No problem with this
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Q2. The only way you could be
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They asked JS basics and Promises, hoisting

Just asked about my work culture, as I worked in startup and product based company, they except me work in Agile and how u will adopt to MNC / service based company culture

It was a hacker coding test mostly javascript questions

Q1. React advance concept
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Q2. Context api how to use that
Ans. 
Context API is a feature in React that allows sharing data between components without having to pass props manually.
• Create a context using createContext() method

• Use the Provider component to wrap the components that need access to the context

• Access the context data using the useContext() hook within the consuming components
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Q3. Higher order component
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Q1. Mainly introduction, how do you manage a project
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Q2. How to debug a code
Ans. 
Debugging a code involves identifying and fixing errors in the code to ensure it runs correctly.
• Use console.log() statements to print out values and check for errors

• Utilize browser developer tools to inspect elements and debug JavaScript

• Step through the code using breakpoints to identify the source of the issue

• Review error messages and stack traces to pinpoint the problem

• Consider using tools like linters and debuggers
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Q3. How to get employee details using group by
Ans. 
Employee details can be retrieved using group by clause in SQL.
• Use GROUP BY clause in SQL to group employee details based on a specific column

• Aggregate functions like COUNT, SUM, AVG can be used with GROUP BY to get summarized employee details

• Example: SELECT department, COUNT(*) as total_employees FROM employees GROUP BY department
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Q1. All about technical questions for SAP Spartacus
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Q1. Salary discussion
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Q1. What are states and props in React?
Ans. 
States and props are important concepts in React for managing and passing data between components.
• States are mutable data that can be changed within a component

• Props are read-only data passed from parent to child components

• States are managed within a component using setState() method

• Props are accessed using this.props in a component
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Q2. What is Virtual DOM
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Virtual DOM is a lightweight copy of the actual DOM that allows for efficient updates and rendering in web applications.
• Virtual DOM is a concept used in frameworks like React to improve performance by minimizing direct manipulation of the actual DOM.

• When changes are made to the virtual DOM, a comparison is done with the actual DOM to determine the minimal updates needed for rendering.

• This process helps reduce the numbe...read more
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Q3. Build a fetch and filter component
Ans. 
A fetch and filter component for data retrieval and manipulation
• Use fetch API to retrieve data from an API endpoint

• Implement a filter function to manipulate the retrieved data based on user input

• Display the filtered data in the UI
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Javascript and React snippets

Q1. React JS and Java script
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Q1. What is Hositing
Ans. 
Hoisting is a JavaScript mechanism where variable and function declarations are moved to the top of their containing scope during the compilation phase.
• Variable declarations are hoisted but not their initializations

• Function declarations are fully hoisted

• Hoisting can lead to unexpected behavior if not understood properly
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Q2. What is closure
Ans. 
Closure is the combination of a function bundled together with references to its surrounding state.
• Closure allows a function to access variables from its outer scope even after the outer function has finished executing.

• It is created whenever a function is defined within another function.

• Closure helps in maintaining the state of a function and allows for data encapsulation.
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