Noise React Js Frontend Developer Interview Questions and Answers

Codding test for machine round

Q1. Technical questions
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Q2. Technical questions 2
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Q1. Personal details round
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Q2. Salary desscuss
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Q1. Difference b/w deep copy and shallow copy
Ans. 
Deep copy creates a new copy of an object with all nested objects also copied, while shallow copy creates a new object with references to the original nested objects.
• Deep copy creates a new object and recursively copies all nested objects, resulting in a completely independent copy.

• Shallow copy creates a new object but only copies the references to nested objects, so changes in nested objects reflect in both the origin...read more
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Q2. Difference between foreach and map
Ans. 
foreach is used to iterate over an array and perform a function on each element, while map creates a new array by applying a function to each element.
• foreach does not return a new array, while map does

• foreach is used for side effects, while map is used for transformation

• Example: forEach - let numbers = [1, 2, 3]; numbers.forEach(num => console.log(num)); // prints 1, 2, 3

• Example: map - let numbers = [1, 2, 3]; let doub...read more
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Q3. Pure impure pipe
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Q4. Ngonchanges usage
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Q5. Basic array methods
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Q6. Difference null undefined empty values in js
Ans. 
null is an intentional absence of any value, undefined means a variable has been declared but not assigned a value, and empty values are variables that have been assigned a value of empty string, empty array, or empty object.
• null is used to represent the intentional absence of any value

• undefined means a variable has been declared but not assigned a value

• Empty values can be empty string (''), empty array ([]), or empty
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Q1. What are class and functional components
Ans. 
Class components are ES6 classes that extend React.Component and have a render method. Functional components are simple functions that return JSX.
• Class components are created using ES6 classes and have a state property.

• Functional components are stateless and do not have a state property.

• Class components can have lifecycle methods like componentDidMount, componentDidUpdate, etc.

• Functional components are simpler and easi...read more
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Q2. Have you ever used hooks?
Ans. 
Yes, I have used hooks extensively in my React Native projects.
• Yes, I have used useState hook to manage component state.

• Yes, I have used useEffect hook for side effects like data fetching.

• Yes, I have used custom hooks to reuse logic across components.
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It had 30 questions including verbal and reasoning.

2 codes were given. One easy and one tough.

Sort an array using a sort algorithm

Politics in india and rest of asis

Q1. No question from hr and team
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Q1. Sap and crm usage
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Q2. Behavioural and aptitude assessment
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