Metricoid Technology Solutions PHP Developer Interview Questions and Answers

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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Q1. Tell me about yourself
Ans. 
I am a passionate web developer with 5 years of experience in front-end and back-end development.
• 5 years of experience in web development

• Skilled in front-end and back-end development

• Passionate about creating user-friendly and efficient websites
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Q2. Rate yourself in different technologies
Ans. 
I rate myself highly in HTML, CSS, JavaScript, and React.
• HTML - Proficient in creating semantic and accessible web pages

• CSS - Skilled in styling and layout design, including responsive design

• JavaScript - Strong understanding of core concepts and modern ES6+ features

• React - Experienced in building interactive and dynamic web applications
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Q3. Technical questions
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Implement a web page as per description

There was a machine test organised as the 1st round of the interview process. The machine test was on Angular

Q1. Throw some light on the new angular feature that doesn't use @NgModule
Ans. 
The new Angular feature that doesn't use @NgModule is called Ivy.
• Ivy is the new rendering engine in Angular that doesn't rely on @NgModule for compilation.

• It allows for faster compilation times and smaller bundle sizes.

• Ivy enables features like improved tree shaking and better debugging capabilities.

• Example: Angular 9 introduced Ivy as the default rendering engine.
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Q2. How would the application work without @NgModule
Ans. 
The application would not work properly without @NgModule as it is required to bootstrap the application and configure dependencies.
• Without @NgModule, the application would not be able to bootstrap and start properly.

• NgModule is used to configure dependencies, such as components, directives, and services.

• NgModule also helps in organizing the application into modules for better maintainability and reusability.
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Q3. Mid level Angular interview questions
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Q4. What are types of directives in angular
Ans. 
Types of directives in Angular include structural directives, attribute directives, and component directives.
• Structural directives are used to add or remove elements from the DOM based on conditions (e.g. *ngIf, *ngFor)

• Attribute directives are used to change the appearance or behavior of an element (e.g. ngStyle, ngClass)

• Component directives are custom directives that are components themselves (e.g. @Component)
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Q5. Can a service file have more than one instance? If yes how?
Ans. 
Yes, a service file can have more than one instance by creating multiple instances of the service class.
• Multiple instances of a service class can be created by instantiating the class multiple times.

• Each instance will have its own state and can be used independently.

• This can be useful for scenarios where multiple instances of the same service are needed to handle different tasks.
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Q6. What are pipes in angular?
Ans. 
Pipes in Angular are used for transforming data in templates.
• Pipes are used to format data before displaying it in the view.

• They can be used to filter, sort, or transform data in various ways.

• Examples include currency, date, uppercase, and lowercase pipes.
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Q1. How to make an application scalable?
Ans. 
To make an application scalable, consider using cloud services, optimizing database queries, caching frequently accessed data, and using microservices architecture.
• Utilize cloud services like AWS or Azure for scalability on demand

• Optimize database queries to improve performance

• Implement caching mechanisms for frequently accessed data to reduce load on servers

• Use microservices architecture to break down the application ...read more
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Q2. Interview questions based on architecture of project and less of technical aspects
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Q1. Salary negotiation, polices discussion, company norms and some basic HR questions.
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Q1. Why do we use database
Ans. 
Databases are used to store, organize, and retrieve data efficiently for various applications.
• Efficient data storage and retrieval

• Data organization and management

• Data security and integrity

• Support for concurrent access and transactions

• Scalability and performance optimization
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Q2. What are SQL joins
Ans. 
SQL joins are used to combine rows from two or more tables based on a related column between them.
• Joins are used to retrieve data from multiple tables in a single query

• Common types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

• Joins are based on a related column between the tables, such as a primary key and foreign key relationship
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Q1. Questions based on javascript, html, css .it will be based on what role you are applying for
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Q2. Css flexbox, box model, html doctype, semantic tags javascript asynchronous , localstorage etc
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There were 3 coding questions in the first round

30 MCQ questions based on Math, reasoning and English and also email writing

Q1. I'm on it my interview scheduled on 14 oct
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Coding round with 4 coding problem

Q1. Interviewer give coding problems which we have to solved face to face
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Q1. Then question answer regarding coding language and you knowledge regarding programming
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Happened on coderbyte

Q1. General English and aptitude questions
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Q1. Project discussion with TL and developing small application F2F
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