Infochord Technologies Web Developer Trainee Interview Questions and Answers

Q1. Opps concept in php
Ans. 
OOPs concept in PHP refers to Object-Oriented Programming principles such as encapsulation, inheritance, polymorphism, and abstraction.
• Encapsulation: Bundling data and methods that operate on the data into a single unit (class)

• Inheritance: Allows a class to inherit properties and methods from another class

• Polymorphism: Ability to present the same interface for different data types

• Abstraction: Hiding the implementation
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Q2. Orm in laravel and explain
Ans. 
ORM in Laravel is Eloquent, a powerful and expressive ORM that allows you to interact with your database using PHP syntax.
• Eloquent is the ORM used in Laravel to interact with the database

• It allows you to define relationships between database tables using Eloquent models

• Eloquent provides methods for querying, inserting, updating, and deleting records in the database

• Example: defining a User model in Laravel and using it
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Q3. Write SQL query for thirst highest salary from employees table
Ans. 
SQL query to find the third highest salary from employees table.
• Use the ORDER BY clause to sort salaries in descending order.

• Use the LIMIT clause to retrieve the third highest salary.

• Consider handling cases where there may be ties for the third highest salary.
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Q1. Caching Strategy
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Q2. What is micro Frontend architecture
Ans. 
Micro Frontend architecture is an approach to building front-end applications by breaking them down into smaller, independently deployable units.
• Allows different teams to work on separate parts of the application

• Each micro frontend can be developed using different technologies

• Enables incremental upgrades and updates without affecting the entire application

• Can improve performance by loading only the necessary components

• ...read more
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Q3. Pure and impure pipes in angular
Ans. 
Pure pipes in Angular are stateless and do not change the input data, while impure pipes can have side effects and change the input data.
• Pure pipes are used for simple transformations like formatting dates or numbers.

• Impure pipes are used for more complex transformations that require state or side effects.

• Pure pipes are faster and more efficient as they only run when a pure change to the input data is detected.

• Impure p...read more
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Q4. How to make singleton services multiton
Ans. 
Singleton services can be made multiton by maintaining a map of instances with unique keys.
• Create a map to store instances with unique keys

• Use a factory method to retrieve instances based on keys

• Ensure that only one instance is created per key
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Q5. What is dependency injection
Ans. 
Dependency injection is a design pattern where components are given their dependencies rather than creating them internally.
• Allows for easier testing by injecting mock dependencies

• Promotes loose coupling between components

• Improves code reusability and maintainability

• Examples: AngularJS, Spring Framework
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Q1. They have asked Backed related question for a ui role.
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Q2. Mostly project related question
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Q1. Javascript object manipulation based coding question
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Q2. React based verbal questions
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Q1. Why you like to join?
Ans. 
I am passionate about PHP development and excited about the opportunity to work with a talented team.
• Passionate about PHP development

• Excited about working with a talented team

• Looking for growth and learning opportunities
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Q2. Will you shift to client location
Ans. 
Yes, I am willing to shift to the client location if required for the job.
• I am open to relocating for the right opportunity

• I understand the importance of being on-site for certain projects

• I have previous experience working at client locations
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Q1. Difference between Var,let and const
Ans. 
Var is function scoped, let and const are block scoped. Var can be redeclared and reassigned, let can be reassigned but not redeclared, const cannot be reassigned or redeclared.
• Var is function scoped

• Let and const are block scoped

• Var can be redeclared and reassigned

• Let can be reassigned but not redeclared

• Const cannot be reassigned or redeclared
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Q2. New features in Angular 10
Ans. 
Angular 10 introduces new features like stricter types, optional strict mode, and performance improvements.
• Stricter types with TypeScript 3.9

• Optional strict mode for better type checking

• Improved build times and smaller bundle sizes

• Updated dependencies like TypeScript 3.9 and TSLib 2.0
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Q1. Javascript concepts: Closure, Promise, Fetch, evening bubbling and capturing. React questions: Features of react, virtual DOM, react hooks, custom hooks.
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Q1. 1. How Virtual DOM is more efficient than real DOM. 2. Coding question: Valid parentheses 3. Usage of Event delegation. 4. Custom events. In-depth questions of JavaScript.
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Q1. Discussion of previous projects. How to handle strict deadline scenarios.
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