Appinop Technologies Senior PHP Developer Interview Questions and Answers

Q1. Run time polymorphism code
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Q2. Linked list code
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Q3. Deep copy shallow copy differences
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Deep copy creates a new copy of an object with its own unique memory space, while shallow copy creates a new object that references the same memory locations as the original object.
• Deep copy duplicates all nested objects, while shallow copy only duplicates the references to nested objects.

• Deep copy ensures that changes to the copied object do not affect the original object, while shallow copy may lead to unintended sid...read more
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Q1. More deep questions about polymorphism code
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Q2. Code for interchange of strings without strcpy
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Use a loop to swap characters of two strings without using strcpy function.
• Create two arrays of characters to store the strings

• Use a loop to iterate through each character of the strings and swap them

• Ensure to handle cases where strings have different lengths
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Q1. What is REST Framework
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Q2. What are the SQL Queries
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This is related to SQL

Q1. Context api, js related qstns, simple programming qstn,
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Q2. Remove duplicates without using set.
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Q1. What are primitive and non primitive data types
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Primitive data types are basic data types provided by the programming language, while non-primitive data types are created by the programmer.
• Primitive data types include int, float, double, char, boolean, etc.

• Non-primitive data types include arrays, classes, interfaces, etc.

• Primitive data types store actual values, while non-primitive data types store references to objects.
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Q2. What are access modifiers and non access modifiers
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Access modifiers control the visibility of classes, methods, and variables. Non-access modifiers provide additional functionality.
• Access modifiers: public, private, protected, default

• Non-access modifiers: static, final, abstract, synchronized

• Example: public class MyClass { private int myVar; }
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Q3. What are all Java 8 features and explain the one which we have used in our project
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Java 8 features include lambda expressions, functional interfaces, streams, and more.
• Lambda expressions allow concise syntax for defining anonymous functions.

• Functional interfaces can have only one abstract method and are used for lambda expressions.

• Streams provide a way to process collections of objects in a functional style.

• Optional class helps to avoid NullPointerException by wrapping a value that may be null.
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Q4. CICD tools which we have used explain in high level
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CICD tools automate the process of building, testing, and deploying code changes.
• Popular CICD tools include Jenkins, GitLab CI/CD, CircleCI, and Travis CI

• These tools help in automating the software development lifecycle

• They enable continuous integration, continuous delivery, and continuous deployment

• CICD tools help in improving code quality, reducing manual errors, and increasing development speed
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Q5. What is containerization
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Containerization is a lightweight, portable, and self-sufficient way to package and run applications.
• Containerization involves encapsulating an application and its dependencies into a container image.

• Containers are isolated from each other and share the host OS kernel.

• Popular containerization platforms include Docker and Kubernetes.

• Containerization allows for easy deployment and scaling of applications.
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Q6. What is indexing in sql
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Indexing in SQL is a technique used to improve the performance of queries by creating a data structure that allows for faster retrieval of data.
• Indexes are created on columns in a database table to speed up the retrieval of rows that match a certain condition in a query.

• They work similar to the index in a book, allowing the database to quickly locate the rows that satisfy the query.

• Indexes can be created using a single...read more
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Q7. Programming question on stream like finding the longest string in a given list of string
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Q1. MVC vs .NET lifecycle
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MVC is a design pattern used in .NET development, while .NET lifecycle refers to the stages of a .NET application's execution.
• MVC is a design pattern that separates an application into three main components: Model, View, and Controller.

• .NET lifecycle refers to the stages of a .NET application's execution, including initialization, execution, and termination.

• MVC helps in achieving separation of concerns and making the c...read more
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Q2. Dispose vs Finalize
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Dispose is used to release unmanaged resources immediately, while Finalize is used for cleanup operations before an object is destroyed by the garbage collector.
• Dispose is called explicitly by the developer, while Finalize is called by the garbage collector.

• Dispose should be implemented in classes that directly interact with unmanaged resources.

• Finalize should be implemented in classes that need to release resources be...read more
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Q3. Liscov Substitution
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Q4. Dom Sanitizer in Angular
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DOM sanitizer in Angular is used to sanitize untrusted HTML to prevent XSS attacks.
• DOM sanitizer is used to sanitize HTML content before rendering it in Angular templates.

• It helps prevent Cross-Site Scripting (XSS) attacks by removing potentially harmful content.

• Angular provides a built-in DomSanitizer service for sanitizing HTML content.

• Example: Using DomSanitizer in Angular template to sanitize a URL before rendering
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Q5. Ngrx state management, how do you manage state in your current project?
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I use Ngrx for state management in my current project by defining actions, reducers, effects, and selectors.
• Define actions to describe user events or interactions

• Create reducers to specify how state should change in response to actions

• Implement effects to manage side effects like API calls

• Use selectors to retrieve specific pieces of state for components
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Q6. Stored procedure vs Functions
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Stored procedures are precompiled SQL queries stored in the database, while functions are reusable code blocks that return a value.
• Stored procedures are used for performing specific tasks or operations on the database.

• Functions are used to encapsulate logic and can be called within SQL queries or other functions.

• Stored procedures can have input and output parameters, while functions always return a value.

• Stored procedu...read more
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Q7. Model binder in MVC
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Model binder in MVC is used to map data from HTTP requests to action method parameters in controllers.
• Model binder maps form data, query string parameters, and route data to action method parameters in MVC controllers.

• It helps in simplifying the process of extracting data from HTTP requests.

• Model binder can be customized by creating custom model binders to handle complex data binding scenarios.
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Q8. Would transaction be rolled back if innermost stored procedure throws an error ?
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Yes, the transaction will be rolled back if the innermost stored procedure throws an error.
• If an error occurs in the innermost stored procedure, it will cause the entire transaction to be rolled back.

• This ensures that the database remains in a consistent state.

• Rolling back the transaction means that any changes made by the stored procedures within the transaction will be undone.
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Q9. NgOninit vs Constructor
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NgOnInit is a lifecycle hook in Angular that is called after the component has been initialized, while the constructor is a TypeScript feature used to initialize class properties.
• NgOnInit is specific to Angular components, while constructor is a general TypeScript feature.

• NgOnInit is used for initialization logic that relies on Angular's view and input bindings being initialized, while constructor is used for basic ini...read more
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Q10. Use of zone.js file
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zone.js is a library for managing asynchronous operations in Angular applications.
• zone.js helps in tracking asynchronous operations and their execution context in Angular applications.

• It provides hooks for intercepting asynchronous tasks like setTimeout, setInterval, and promises.

• zone.js can be used for profiling, debugging, and error handling in Angular applications.
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Q11. Write a query to identify and remove duplicated from a table.
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Use a query with GROUP BY and HAVING clause to identify and remove duplicates from a table.
• Use GROUP BY to group rows with the same values

• Use HAVING COUNT(*) > 1 to identify duplicates

• Use DELETE statement to remove duplicates
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3 coding problems
1 aptitude
1 puzzle
3 hrs duration

Q1. Sorting algorithms
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Q2. 1 puzzle - burning candles
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Q1. General discussion on resume
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Q2. Few reasoning questions
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Q1. About company work culture
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Q1. Every single oops concepts
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Q2. Every sql questions possiible
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Q1. I attended only technical not yet results announced
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Q2. I attended only technical not yet result announced
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