20+ Sparkle Infotech Interview Questions and Answers

In such cases, it is important to analyze the issue thoroughly on the production server and implement a fix cautiously.

• First, analyze the logs and error messages on the production server to understand the root cause of the issue.

• Check for any recent changes or updates that might have caused the problem.

• If possible, try to replicate the issue in a controlled environment like staging or local to further investigate.

• Consult with team members or experts to brainstorm possible sol...read more

To write a custom authentication & middleware in Laravel, you can create a custom guard and middleware classes.

• Create a custom guard by extending the 'Illuminate\Auth\Guard' class and implementing the necessary methods like 'validate' and 'user'.

• Register the custom guard in the 'auth.php' configuration file.

• Create a custom middleware by extending the 'Illuminate\Auth\Middleware\Authenticate' class and implementing the 'handle' method.

• Register the custom middleware in the 'app...read more

Use Laravel's Eloquent ORM with chunking and eager loading for optimized fetching of 5 million records from 3 tables in a single DB.

• Use Laravel's Eloquent ORM to fetch records efficiently

• Use chunking to process large datasets in smaller, manageable chunks

• Utilize eager loading to reduce the number of queries executed

Use the migrate:rollback command with --step option to rollback to a specific version in Laravel migration.

• Use php artisan migrate:rollback --step=n command to rollback n number of migrations.

• Specify the number of migrations to rollback to a specific version.

• For example, php artisan migrate:rollback --step=3 will rollback the last 3 migrations.

Laravel uses a unique session identifier to find a specific session for each user.

• Laravel generates a unique session ID for each user upon login

• The session ID is stored in a cookie on the user's browser

• Laravel uses the session ID to retrieve the user's session data from the server

To send asynchronous notifications in Laravel, use queues to handle background processing.

• Use Laravel's built-in queue system to send notifications asynchronously.

• Define a notification class and use the ShouldQueue interface to indicate that the notification should be sent asynchronously.

• Dispatch the notification using the queue driver of your choice (e.g. database, Redis, Amazon SQS).

Custom requests with validations in Laravel can be handled using Form Requests.

• Create a new Form Request using artisan command: php artisan make:request CustomRequest

• Define validation rules in the authorize() and rules() methods of the CustomRequest class

• Inject the CustomRequest class into your controller method to automatically validate the incoming request

Indexing in DB tables improves query performance by allowing the database to quickly locate specific rows.

• Indexes help in speeding up data retrieval operations by providing quick access to rows based on the indexed columns.

• They reduce the number of disk I/O operations required to fetch data, resulting in faster query execution.

• Indexes can also enforce uniqueness constraints and improve the efficiency of joins between tables.

• Examples: Creating an index on a 'user_id' column in...read more

The 'Key' directive in Vue is used to uniquely identify elements in a list to improve performance and prevent re-rendering.

• Helps Vue efficiently update the DOM by reusing existing elements instead of creating new ones

• Prevents unnecessary re-rendering of elements in a list when their order changes

• Improves performance by allowing Vue to track and update specific elements based on their keys

• Example:

  {{ item.name }}

The composer.lock file is used to lock the exact versions of dependencies in a project to ensure consistent builds.

• Prevents different versions of dependencies from being installed on different machines

• Ensures that all developers are using the same versions of dependencies

• Helps in maintaining consistency and stability of the project

Sessions store data on the server side, while cookies store data on the client side.

• Sessions store data on the server side, while cookies store data on the client side.

• Sessions are more secure as the data is stored on the server and not accessible by the client.

• Cookies are limited in size (4KB) and can be disabled by the client, while sessions have no such limitations.

Laravel Notifications allow you to send notifications across multiple channels. Different types of mailers in Laravel include SMTP, Mailgun, and Sendmail.

• Laravel Notifications can be sent through email, SMS, Slack, and more

• SMTP mailer is commonly used for sending emails in Laravel

• Mailgun is a popular mailer service that can be integrated with Laravel for sending emails

• Sendmail is another option for sending emails in Laravel

To write a unit test in Laravel #8, use PHPUnit and create test classes that extend the TestCase class.

• Create a new test class in the 'tests' directory.

• Extend the class with PHPUnit's TestCase class.

• Write test methods within the class to test specific functionality.

• Use assertions provided by PHPUnit to check if the code behaves as expected.

• Run the tests using the 'php artisan test' command.

Laravel Queue is a feature that allows you to delay the execution of a time-consuming task, improving application performance.

• Queues help in offloading time-consuming tasks to be processed in the background

• Tasks are added to the queue and processed by workers asynchronously

• Laravel provides drivers like Redis, Beanstalkd, and Amazon SQS for queue management

Using 'Scope' in style allows us to apply styles to specific elements within a component.

• Scope in style allows us to target specific elements within a component without affecting others

• It helps in organizing and managing styles more efficiently

• Scope can be used to prevent styles from leaking out of a component

Polymorphism in Laravel relationships allows a model to belong to multiple other models.

• Polymorphic relationships allow a model to belong to multiple other models.

• It is useful when a model can belong to more than one other model.

• For example, a Comment model can belong to either a Post or a Video model.

Vue 3 is the latest version of Vue.js with improved performance, new features, and better TypeScript support.

• Vue 3 uses a new reactivity system called the Composition API, which offers more flexibility and better organization of code compared to Vue 2's Options API.

• Vue 3 introduces a new compiler that generates optimized code for better performance.

• Vue 3 provides better TypeScript support with improved type inference and better integration with TypeScript.

• Vue 3 has a smaller ...read more

Options API is more verbose and flexible, while Composition API is more organized and reusable.

• Options API allows defining component options in separate sections like data, methods, computed, etc.

• Composition API allows organizing code based on logic and reusability with setup() function.

• Options API is suitable for smaller projects or when starting with Vue, while Composition API is recommended for larger projects or complex logic.

• Composition API promotes better code organizat...read more

To upgrade Laravel, you need to follow the official documentation and use Composer to update dependencies.

• Check the Laravel documentation for the specific version you are upgrading to

• Update your composer.json file with the new Laravel version

• Run 'composer update' command in your terminal to update dependencies

• Check for any deprecated features or changes in the new version and make necessary adjustments