Arrise Bpo Solutions Front end Developer Interview Questions and Answers

Q1. Basics of react and JavaScript
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Q1. Angular lifecycle hooks
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Q2. JS interview questions
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Recurrsion tree implementation with angular

Q1. Let var const in JavaScript
Ans. 
var and const are used to declare variables in JavaScript, with var being mutable and const being immutable.
• var is used to declare variables that can be reassigned and updated

• const is used to declare variables that cannot be reassigned or updated

• let is another keyword used for declaring variables, similar to var but with block scope
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Q2. Error boundary and how to handle
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Error boundary is a React component that catches JavaScript errors anywhere in a component tree and logs those errors.
• Error boundaries are React components that catch JavaScript errors in their child component tree.

• They are used to prevent the entire UI from crashing due to a single error.

• Error boundaries work like a JavaScript catch {} block, but for components.

• They are defined using componentDidCatch lifecycle method...read more
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Q3. Event.bind and event.property
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Q4. Use of never in typescript
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The 'never' type in TypeScript represents a value that will never occur.
• Used to indicate that a function will not return a value

• Commonly used in union types to exclude certain values

• Helps catch potential errors at compile time
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Q5. What hooks you have used
Ans. 
I have used React hooks such as useState, useEffect, useContext, and useRef in my projects.
• useState

• useEffect

• useContext

• useRef
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Q6. What is difference between use reducer and use state
Ans. 
useReducer is preferred for managing complex state logic, while useState is simpler for basic state management.
• useReducer is more suitable for managing complex state logic and multiple state values

• useState is simpler and more straightforward for basic state management with a single value

• useReducer allows for more organized and centralized state updates through actions and reducers

• useState is commonly used for simple co...read more
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Q7. Why we use state and props
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Q8. How you will pass data from parent to child
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Q9. Write your own custom hook
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Q10. Explain map filter and reduce functions
Ans. 
Map, filter, and reduce are higher-order functions in JavaScript used to manipulate arrays.
• Map: Transforms each element in an array and returns a new array with the transformed elements.

• Example: [1, 2, 3].map(num => num * 2) returns [2, 4, 6].

• Filter: Returns a new array with elements that pass a certain condition.

• Example: [1, 2, 3].filter(num => num > 1) returns [2, 3].

• Reduce: Applies a function against an accumulator ...read more
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Q11. How you can clone an object
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To clone an object in JavaScript, you can use the spread operator or Object.assign() method.
• Use the spread operator to create a shallow copy of an object: const clonedObj = { ...originalObj };

• Use Object.assign() method to create a shallow copy of an object: const clonedObj = Object.assign({}, originalObj);

• For deep cloning, you can use libraries like Lodash or write a custom function to recursively clone nested objects.
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Q12. What are the three stages of event propagation and how to handle it
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Event propagation consists of three stages: capturing, target, and bubbling.
• Capturing phase: Events are captured from the outermost element to the target element.

• Target phase: Event reaches the target element where the event originated.

• Bubbling phase: Events bubble up from the target element to the outermost element.
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Q13. How to handle errors in your react application
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Errors in a React application can be handled by using error boundaries, try-catch blocks, and displaying error messages to users.
• Use error boundaries to catch errors in components and display a fallback UI

• Wrap code that may throw errors in try-catch blocks to handle exceptions

• Use libraries like React Error Boundary to easily implement error handling

• Display error messages to users to inform them about the issue and poss...read more
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Q14. Write code to call fake api and display the title where category is “some category “
Ans. 
Fetch data from a fake API and display titles based on a specific category using JavaScript and Fetch API.
• Use the Fetch API to make a GET request to the fake API endpoint.

• Filter the response data to find items where the category matches 'some category'.

• Display the titles of the filtered items in the DOM.
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Q1. Reverse given array
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Q1. Call api and print data in using react
Ans. 
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
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Q1. Defined your self to about your aducation and
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Q2. What is computer in your language
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Q3. What about html What is the you html in frontend
Ans. 
HTML is the standard markup language for creating web pages and applications.
• HTML stands for HyperText Markup Language

• It is used to structure content on the web

• HTML elements are used to define the different parts of a webpage

• Examples include <h1> for headings, <p> for paragraphs, and <img> for images
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