Protocol Zone Front end Developer Interview Questions, Process, and Tips

It was a MCQ based questions on JavaScript, React, Redux

1 Coding question from string topic

Q1. What is redux, when to use it
Ans. 
Redux is a predictable state container for JavaScript apps. It helps manage the state of your application in a more organized way.
• Redux is typically used in large-scale applications with complex state management needs

• It helps in maintaining a single source of truth for the state of your application

• Redux works well with React, but can be used with any other JavaScript framework or library

• Actions are dispatched to update
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Q2. Is it optimal to use redux for single state
Ans. 
No, it is not optimal to use redux for single state
• Redux is typically used for managing complex state across multiple components

• Using redux for a single state can add unnecessary complexity to the codebase

• Consider using React's built-in state management for simpler cases
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Q3. What are the key features of SCSS
Ans. 
SCSS is a preprocessor scripting language that is a superset of CSS, adding features like variables, nesting, and mixins.
• Variables allow for reusable values throughout a stylesheet

• Nesting helps to keep styles organized and easier to read

• Mixins allow for reusable blocks of styles to be included in other selectors

• SCSS supports operations like math calculations and functions

• SCSS can be compiled into regular CSS for use in
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Q4. What is Websocket i.o, why it is being used
Ans. 
Websocket i.o is a JavaScript library that enables real-time, bidirectional and event-based communication between the browser and the server.
• Allows for real-time communication between client and server

• Enables bidirectional data transfer

• Supports event-based communication

• Used for applications requiring real-time updates like chat applications, online gaming, live tracking, etc.
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Q5. Difference between forIn and forOf loop,
Ans. 
forIn loop iterates over the enumerable properties of an object, while forOf loop iterates over the values of an iterable object.
• forIn loop is used for iterating over object properties, while forOf loop is used for iterating over array elements.

• forIn loop can be used with objects, while forOf loop can be used with arrays, strings, maps, sets, etc.

• Example: forIn loop - for (let key in object) { console.log(key); }

• Exampl...read more
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Q6. What is filter method which is better to use filter method or foor loop
Ans. 
The filter method is a built-in JavaScript method used to create a new array with all elements that pass a certain condition.
• Filter method is more concise and readable compared to for loop

• Filter method is more declarative and functional programming oriented

• Example: const numbers = [1, 2, 3, 4, 5]; const evenNumbers = numbers.filter(num => num % 2 === 0);

• Example: const words = ['hello', 'world', 'example']; const shortW
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Q1. What motivates you to join protocolzone
Ans. 
I am motivated to join ProtocolZone because of their innovative projects and collaborative team environment.
• Exciting projects at ProtocolZone

• Collaborative team environment

• Opportunity for growth and learning

• Alignment with company values and mission
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Q2. Any questions from your side
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