Webtree Media Solutions Php Full Stack Developer Interview Questions and Answers

Q1. What is Singleton design patterns and how to implement?
Ans. 
Singleton design pattern ensures a class has only one instance and provides a global point of access to it.
• Ensure a class has only one instance by providing a global access point to it

• Use a private constructor to restrict instantiation of the class

• Provide a static method to access the instance of the class
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Q2. Dependency Injection
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Q3. What is extension method and write the code.
Ans. 
Extension methods allow adding new methods to existing types without modifying the original type.
• Extension methods must be defined in a static class.

• The first parameter of an extension method specifies the type being extended and is preceded by the 'this' keyword.

• Extension methods can be called as if they were instance methods of the extended type.
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Q1. Life cycle hooks in angular
Ans. 
Life cycle hooks in Angular are functions that are called at specific points in the component's life cycle.
• ngOnChanges: Called when an input property changes

• ngOnInit: Called once the component is initialized

• ngOnDestroy: Called before the component is destroyed
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Q2. How to send data from child to parent component
Ans. 
Use event emitters or callback functions to send data from child to parent component in Angular
• Use @Output decorator in Angular to create custom events in child component and emit data to parent component

• Pass a function as a prop from parent to child component, which child can call to send data back to parent

• Use services to share data between components in Angular
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Q1. What is the goal of this year
Ans. 
The goal of this year is to enhance my skills in full stack .NET development and contribute to impactful projects.
• Enhance skills in full stack .NET development through continuous learning and practice

• Contribute to impactful projects by delivering high-quality code and solutions

• Collaborate with team members to achieve project goals and deadlines
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Q1. ES6 new features
Ans. 
ES6 introduces new features like arrow functions, classes, template literals, let and const declarations, and more.
• Arrow functions provide a more concise syntax for writing functions.

• Classes allow for easier object-oriented programming in JavaScript.

• Template literals enable easier string interpolation and multiline strings.

• let and const declarations provide block-scoped variables.

• ES6 also introduces features like destr...read more
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Q2. Closure and their coding questions
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Q3. Lazy loading and redux working in react
Ans. 
Lazy loading is a technique used to defer loading of non-essential resources until they are actually needed, while Redux is a state management library for React applications.
• Lazy loading in React involves dynamically importing components or modules only when they are required, improving performance by reducing initial load times.

• Redux is used in React applications to manage the state of the application in a predictable...read more
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Q4. Call by value & call by reference, object-related, hoisting etc
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Q5. How do we optimize the API and rendering in React?
Ans. 
Optimizing API and rendering in React involves reducing unnecessary API calls, using memoization, lazy loading, and code splitting.
• Reduce unnecessary API calls by batching requests or using GraphQL to fetch only required data.

• Use memoization techniques like useMemo and useCallback to prevent unnecessary re-renders.

• Implement lazy loading for components that are not immediately needed, improving initial load time.

• Utilize...read more
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Q1. What is virtual DOM?
Ans. 
Virtual DOM is a lightweight copy of the actual DOM that allows for efficient updates and rendering in web applications.
• Virtual DOM is a concept used in frameworks like React to improve performance by minimizing direct manipulation of the actual DOM.

• When changes are made to the virtual DOM, a comparison is done with the actual DOM to identify the minimal number of updates needed.

• This approach reduces the number of DOM ...read more
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Q2. What is foriegn Key SQL?
Ans. 
Foreign key in SQL is a field in a table that is a primary key in another table, establishing a relationship between the two tables.
• A foreign key constraint ensures referential integrity between two related tables.

• It helps maintain consistency and avoid orphan records.

• Example: In a database with tables 'orders' and 'customers', the 'customer_id' in 'orders' table can be a foreign key referencing the 'id' column in 'cus
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Q1. What is props
Ans. 
Props are read-only properties that are passed from a parent component to a child component in React.
• Props allow data to be passed down the component tree.

• Props are immutable and cannot be changed by the child component.

• Props are accessed in the child component using this.props.
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Q2. What is Good feedback you ever got in during you development period.
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Q1. What is closures in JS ?
Ans. 
Closures in JavaScript are functions that have access to variables from their outer scope, even after the outer function has finished executing.
• Closures are created when a function is defined inside another function.

• The inner function has access to the outer function's variables, parameters, and even the outer function's return value.

• Closures are useful for creating private variables and data encapsulation.

• They can be ...read more
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Q2. Diff props and state ?
Ans. 
Props and state are both used in React to manage and pass data, but they have different purposes and behaviors.
• Props are read-only and passed from parent components to child components.

• State is mutable and managed within a component.

• Props are used to pass data from a parent component to a child component.

• State is used to manage and update data within a component.

• Props are passed as attributes to a component in JSX.

• Stat...read more
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Q3. How to optimise the performance ?
Ans. 
Performance optimization involves identifying and resolving bottlenecks to improve the efficiency of software.
• Identify and analyze performance bottlenecks

• Optimize algorithms and data structures

• Improve database performance through indexing and query optimization

• Use caching techniques to reduce database and network calls

• Minimize network latency by optimizing network requests

• Optimize front-end code by reducing DOM manipul...read more
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Q4. Diff between class based or function based component ?
Ans. 
Class-based components are ES6 classes that extend React.Component, while function-based components are functions that return JSX.
• Class-based components are more feature-rich and have access to lifecycle methods.

• Function-based components are simpler and easier to read and test.

• Class-based components can have state and use lifecycle methods like componentDidMount and componentDidUpdate.

• Function-based components can use ...read more
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Q5. What is es6 features ?
Ans. 
ES6 (ECMAScript 2015) introduced several new features to JavaScript, enhancing its functionality and making it more efficient.
• Arrow functions: concise syntax for writing functions

• Let and const: block-scoped variables

• Template literals: easier string interpolation

• Destructuring assignment: extracting values from arrays or objects

• Spread syntax: expanding elements in arrays or objects

• Classes: syntactical sugar for creating ...read more
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Php, java, HTML, SQL, NODE js

Q1. Html, css,javascript
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Q2. Php, Node.js html, css
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Q3. Bootstrap 5 , python,
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Q1. Tell me about yourself
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Normal questions aptitude

Q1. Why Spring boot over spring, beans scope, spring annotation, ReactJS data fetching
Ans. 
Spring Boot is preferred over Spring for easier setup and configuration. Beans scope defines object lifecycle. Spring annotations simplify configuration. ReactJS for efficient data fetching.
• Spring Boot is preferred for its convention over configuration approach, making setup and configuration easier.

• Beans scope in Spring defines the lifecycle of objects, such as singleton, prototype, request, session, etc.

• Spring annota...read more
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Q1. Tell me about yourself
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I will ready for my first round is aptitude test

I will ready for my second round is coding test

Q1. Why should i hired you
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Q2. What is your short term goal.
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Q3. What is your long term goals.
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Q4. What is your hobbies.
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Q1. My last round is hard round
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