20+ Ways2excel Interview Questions and Answers

Delegates are reference types that hold a reference to a method. They are used to achieve loose coupling and extensibility.

• Delegates allow methods to be passed as parameters to other methods.

• They can be used to implement callbacks and event handlers.

• Delegates can be multicast, meaning they can hold references to multiple methods.

• There are two types of delegates: singlecast and multicast.

Base href in index.html is used to specify the base URL for all relative URLs in the document.

• Base href is used to set the base URL for all relative URLs in the document.

• It is helpful when working with multiple directories or when the website is hosted on a subdirectory.

• Example: <base href='https://www.example.com/'>

Multicasting in Angular is a technique to broadcast a single stream of data to multiple subscribers.

• It allows multiple subscribers to receive the same data stream.

• It reduces the number of HTTP requests made by the application.

• It can be achieved using RxJS operators like multicast() and refCount().

Component interaction is the process of communication and data exchange between different software components.

• Components can interact through APIs, events, or shared memory.

• APIs allow components to expose their functionality to other components.

• Events enable components to notify each other of changes or trigger actions.

• Shared memory allows components to access and modify the same data.

• Component interaction is crucial for building complex software systems.

Two way binding is a technique used in software development to keep data synchronized between the model and the view.

• Two way binding allows changes made to the model to be reflected in the view and vice versa.

• It is commonly used in front-end frameworks like Angular and React.

• In Angular, two way binding is achieved using [(ngModel)] directive.

• In React, two way binding can be achieved using state and props.

• Two way binding can improve user experience by reducing the need for man...read more

Polyfills are code that allows modern browsers to support features that are not natively supported.

• Polyfills are used to bridge the gap between modern web development and older browsers.

• They provide a way to use new features without worrying about browser compatibility.

• Polyfills can be used for features like CSS Grid, Fetch API, and ES6 syntax.

• They are often included in JavaScript libraries and frameworks like React and Angular.

Connection pooling is a technique of reusing database connections to improve performance.

• Connection pooling helps to reduce the overhead of creating and closing database connections.

• It maintains a pool of database connections that can be reused by multiple clients.

• It improves the scalability and performance of the application.

• Connection pooling can be configured with parameters like maximum pool size, timeout, etc.

• Examples of connection pooling libraries are HikariCP, Apache ...read more

SOLID principles are a set of five design principles for writing maintainable and scalable code.

• S - Single Responsibility Principle

• O - Open-Closed Principle

• L - Liskov Substitution Principle

• I - Interface Segregation Principle

• D - Dependency Inversion Principle

Generations of Garbage collection are used to manage memory in Java applications.

• Garbage collection is the process of automatically freeing up memory that is no longer in use by the application.

• Generational garbage collection divides objects into different generations based on their age and usage patterns.

• Young generation is where new objects are created and old objects that survive multiple garbage collections are moved to the old generation.

• Old generation is where long-live...read more

API versioning is the process of managing and updating different versions of an API.

• API versioning allows developers to make changes to an API without breaking existing client applications.

• It involves assigning a version number to each release of the API.

• Versioning can be done through URL paths, headers, or query parameters.

• Examples of API versioning include Twitter API v1.1 and Google Maps API v3.

• API versioning is important for maintaining backwards compatibility and ensurin...read more

Prevent SQL Injection by using parameterized queries and input validation.

• Use parameterized queries instead of concatenating user input with SQL statements.

• Sanitize user input by validating and escaping special characters.

• Limit database user privileges to only necessary actions.

• Implement web application firewalls to detect and block SQL injection attempts.

• Regularly update and patch software to fix known vulnerabilities.

Route guards are used in Angular to prevent unauthorized access to certain routes.

• Route guards can be used to check if a user is authenticated before allowing access to a route.

• There are three types of route guards: CanActivate, CanActivateChild, and CanLoad.

• CanActivate is used to protect individual routes, while CanActivateChild is used to protect child routes.

• CanLoad is used to prevent lazy-loaded modules from being loaded until certain conditions are met.

Life cycle hooks are methods that allow you to tap into the lifecycle of a component in Angular.

• Life cycle hooks are used to perform actions at specific stages of a component's lifecycle.

• There are eight different life cycle hooks in Angular.

• Examples of life cycle hooks include ngOnInit, ngOnChanges, and ngOnDestroy.

AOT stands for Ahead of Time compilation, a technique used to compile code before it is executed.

• AOT is used to improve the performance of applications by compiling code before it is executed.

• It is commonly used in mobile app development to reduce app startup time.

• AOT can also help to reduce the size of the application binary.

• Examples of AOT compilers include Google's Android Runtime (ART) and Apple's LLVM-based compiler.

I orient myself with the cardinal directions and locate my starting point.

• Identify North, South, East, and West on the map

• Locate my current position or starting point

• Determine the direction and distance to my destination

IEnumerable is in-memory collection while IQueryable is a queryable data source.

• IEnumerable is used for querying data from in-memory collections like List, Array, etc.

• IQueryable is used for querying data from a database or remote data source.

• IQueryable supports deferred execution while IEnumerable does not.

• IQueryable allows for filtering, sorting, and paging to be done on the server side.

• IQueryable is more efficient when dealing with large datasets.

Observables are streams of data while Promises are one-time operations.

• Observables can emit multiple values over time while Promises can only resolve once.

• Observables can be cancelled while Promises cannot.

• Observables are lazy while Promises are eager.

• Observables can handle errors within the stream while Promises require a catch block.

• Observables are used in reactive programming while Promises are used in asynchronous programming.

Components required for writing a user story

• User persona

• User goal

• Acceptance criteria

• Priority

• Estimate

• Description

IEnumerable is an interface while List is a class in C#.

• IEnumerable is read-only and can only be iterated over.

• List is a collection that can be modified and indexed.

• IEnumerable is more memory efficient for large datasets.

• List has more functionality like sorting and searching.

• IEnumerable can be used with LINQ queries.

• List is faster for small datasets.

Best practices for capturing accurate requirements

• Engage stakeholders to understand their needs

• Use clear and concise language to avoid ambiguity

• Document requirements in a structured format

• Validate requirements with stakeholders

• Prioritize requirements based on business value

I recommend a feature to schedule messages in WhatsApp.

• Users can schedule messages to be sent at a later time

• This can be useful for sending birthday wishes or reminders

• Users can also edit or cancel scheduled messages before they are sent

Process flow for booking an Uber ride for a friend

• Open the Uber app and select the 'Where to?' option

• Enter the destination and tap on the 'Ride' option

• Select the 'Someone else' option and enter your friend's name and phone number

• Confirm the ride details and request the ride

• Your friend will receive a text message with the driver's details and can track the ride in real-time

Technical knowledge developers are essential for creating and maintaining complex software systems.

• Technical knowledge developers possess the skills and expertise necessary to design, develop, and implement software solutions.

• They are responsible for ensuring that software systems are efficient, reliable, and secure.

• They stay up-to-date with the latest technologies and programming languages to ensure that their skills remain relevant.

• Examples of technical knowledge developers...read more

To upgrade db2 version in HADR, you need to follow a specific process to ensure minimal downtime and data loss.

• Ensure all prerequisites are met before starting the upgrade process

• Perform a full backup of the primary and standby databases

• Stop the HADR on the standby server

• Upgrade the primary server to the new version of db2

• Upgrade the standby server to the new version of db2

• Restart HADR on the standby server

• Verify the synchronization between primary and standby servers

Brittle materials break without significant deformation, while ductile materials can undergo significant deformation before breaking.

• Brittle materials break with little or no plastic deformation

• Ductile materials can undergo significant plastic deformation before breaking

• Examples of brittle materials: glass, ceramics

• Examples of ductile materials: metals like copper, aluminum

The revenue of the top player in the sanitizer market is not available.

• The revenue of the top player in the sanitizer market is not publicly disclosed.

• However, some estimates suggest that the top player in the market is Reckitt Benckiser, with a global market share of around 20%.

• Other major players in the market include Procter & Gamble, Unilever, and 3M.

• The COVID-19 pandemic has led to a surge in demand for sanitizers, resulting in increased revenue for many companies in the...read more

Daily activities as a DBA involve managing databases, ensuring data security, optimizing performance, and troubleshooting issues.

• Monitoring database performance and ensuring availability

• Implementing and maintaining backup and recovery plans

• Optimizing database queries and indexes

• Troubleshooting and resolving database issues

• Implementing security measures to protect data

• Collaborating with developers and system administrators

SN diagram is a graphical representation of stress versus number of cycles to failure for a material.

• SN diagram helps in understanding the fatigue behavior of a material under cyclic loading.

• It shows the relationship between stress amplitude and the number of cycles to failure.

• Materials with higher endurance limits have steeper slopes on the SN diagram.

• SN diagrams are commonly used in engineering to design components that can withstand cyclic loading.

• Example: Steel SN diagram...read more