Jignesh Gondaliya

Hello. Myself, I'm carrying over 5.5 5 years of experience in, back end and front end technologies. In the back end, my in back end, my expertise are in a PHP Laravel coordinator Node. Js. And in front end, my expertise in, HTML series is Mooshepp and React. Js. I have also worked, with, 3rd party APIs and, REST APIs. And, in the database, I have experience in MySQL and MongoDB. And, for the server, I have experience in AWS EC 2 instance and CloudFront Technologies. That's all about me. Thank you.

And yeah. so to manage database transaction Laravel, and ensure asset properties, which is atomicity, consistency, isolation, and durability, are maintained. I can employ the strategies like database transition. So in which, I will use Laravel between database transaction method like d b e d b being transaction, d b commit, and d b rollback to rep to rep the database operation. this will ensure, that either all the operation within transaction are completed successfully or none of them are applied. Then error handling. So that will implement proper error handling mechanism within transaction blocks to catch exception and the robot transaction when error occur, ensuring consistency. And, then isolation levels. So, no, for that, choose up for that, we have to choose appropriate isolation level for the transaction to manage the level of to manage the level of visibility and concurrency. Lara will support, setting isolation using database configuration or query builder. And, then testing. So, thoroughly, we have to test the database transaction, especially in scenarios involving concurrent access to ensure that data integrity data integrity is maintained under different conditions. And then optimistic locking. so for that to we have to use optimistic locking technique to create concurrent modification to the same data by multiple users. Lara will provide support for optimistic locking through the lock for update method. And, then database constraints. So we have to define appropriate database constraints, such as a foreign key constraint, unique constraint, and the check constraint to enforce data integrity at the at the database level.

Okay. so to rendering reactor, to optimize to optimize rate rendering process when handling that dataset and integrate with parallel backend. we have to use we have to we have to use virtualization, in which we have to use libraries like react virtualize or react to window to render only the visible items that will reducing the memory footprint and improve the performance. then pagination or infinite scrolling. So in which fetch data in smaller chunks to avoid loading all data at once, This reduce the initial load time and improves user experience. Laravel pagination features can help with this. And then the memoization and pair components. So the memo is expensive computations and use the square component or normalization technique to create unnecessary re renders. Then we have to use of IndexedDB or local storage or local storage, then optimize API response, and then implement server side, SSR. That means server side server side rendering, caching, and then lazy loading. It means load components, images, and other asset asynchronously to prioritize the initial rendering and improve overall improve overall performance. here, I mentioned the caching, which means implement caching mechanism at on both the front end and back end to reduce the load on the server and speed and speed up the subsequent request. As I mentioned, SSR server side rendering, in which we have to render the initial HTML on the server to improve perceived performance and SEO, then iterate with then iterate with React on the client side. Libraries, like, in interior.jaz or livewire.

okay. So in Laravel app, by using by using MySQL indexes, can be significantly improve the query performance, in that means faster data retrieval, optimize sorting and filtering, and enhance join performance, and the reduced or disk IO. Okay? So the partial data rate table means in indexes act like a table, of content for your for your database tables. When you execute a query that in those index columns, MySQL can quickly locate the rows to matching the query criteria and leading to leading to faster data retrieval. optimized sorting and filtering means in indexing indexes speed up the sorting and filtering operation by reducing by reducing the numbers of rows that need to be scanned. For example, if you have an index on a column used in where clause or in order where clause, so MySQL can use the indexes to efficiently locate and sort the sort the relevant rows. and a join performance means index can also improve the performance of join operation by allowing MySQL to quickly locate the rows in the join in the join table that met the join that met the join condition. Yeah. the last one I was I mentioned was reduced disk IO. So by using indexes, MySQL can MySQL can minimize the disk IO operation because it doesn't have to scan the entire table to find the requested data. Instead, it can use the indexes to directly access the, directly access the relevant rows.

Okay, so for the AWS S3, that includes a few steps like the, like first of all, we have to set up a AWS S3 bucket. So for that, we have to create an S3 bucket in AWS account to store the uploaded files and then configure the bucket permission to allow access only to authorized user. Then we have to install AWS SDK for PHP. So we can do that by the command composer require AWS forward slash AWS SDK PHP. And then we have to configure AWS credential. So we will add AWS configuration in config service.php file or use environment variable for security. Then we have to ensure that the IAM user is associated with the credential that has permission to access the S3 bucket. Then we have to create the file upload form. So we have to implement the file upload form in Laravel application view using HTML forms or Laravel form helper method. And then we have to handle file upload in the controller. So for that, we have to create a controller method to handle the file upload. In this method, we will use the store method to store the upload file on S3 bucket. And then we will write the function. And then we have to securely handle the file upload. So for that, we will validate the upload file to ensure it meets the application requirement. For example, file type and sizes. And then we have to return, and then we have to return response. So after successful file upload, it will return response to the user including a success or fail. And then we have to check the access control. That means we have to set up appropriate access control setting on the S3 bucket to control who can access the uploaded files. Thank you.

Okay. so the Laravel queue system queue system background processing and what AWS services would complement it. okay. so the Laravel queue session of facial background facial background by allowing to defer the processing of time consuming tasks, such as sending emails sending image, processing image, or interacting with the external APIs to a later time. So this so this help improve the responsiveness of your application by uploading nonessential, task flow queue, which can which can be processing synchronizing. So how Laravel queue work? so then my question is how Laravel queue work? So first to first, we have first, we have to make configuration. Laurel's out of the multiple queue QDAVALS out of the box, including Redis, Amazon HQs, and others. You can configure the q driver in the config q dot PHP configuration file. the second task is job dispatching. So when you want to execute a task asynchronously, you dispatch a job to the queue using Laravel's dispatch method. This method queues the job for later processing. And then comes queue workers. So queue workers are processed. That continuously monitored that continuously monitor the queue for incoming job. When a job is audible, a worker pick it up and execute it execute it. You can start 1 or more queue who queue worker using Laravel's queue work artisan command. And then the last one is the job execution. So each job class in Laravel represents unit of work that need to be performed, you define the logic for the job. You define logic for the job with it handle method. So the automatically serialize and deserialize job object, making it easy to pass complex data structure between your application and the queue workers. as for the AWS services, that the complement that complement Laravel, queue system. For that, we can use sim simple queue service, which is Amazon SQS and Amazon SNS. That is a simple notification service. Then Amazon Lambda. Then Amazon ECS, which is Elastic Container Service.

Okay, so the code snippet stay is. is a method of getUser that attempts to find a user by their ID and it returns the user data as a JSON. If the user is not found, it's supposed to return JSON with an error message and 404 HTTP status code. So, there could be problem with the request ID part if the ID is not being passed correctly in the request or if the ID field does not exist on the request object or on the request object. So, another potential issue could be with the user find method. Perhaps if it's not working as expected due to the database connection issue or model configuration problem in the ORM being used. To debug this, I would first ensure that the $request object contains the expected ID field and that it's being passed correctly. I would also check the user model to make sure it's set up correctly and can connect to the database. Checking the logs for any errors that occurred during the request could provide further insight into what might be going wrong. By adding error handling to catch any access during the find operation and logging this exception could also be helpful for debugging purpose. Additionally, the testing method with a known user ID to see if it returns the correct response would be a good step to confirm that the method works under the same conditions.

Okay. So the user profile so there's so the user profile, which includes constructor and handles a method for sending user data along with the render method. So the potential issue is there is no actual button in the render in the render method to trigger the handles of method. To the render method should in include a button that when clicked calls the handles method. The so for the better state management, we can use, save service or data function, handles error and update the component state accordingly. use control component for form input to sync the formulas with the component's state. we have to replace the alert with less intrusive way to notify user of the save status. Then we have to add the handle show method to a button in the render method. If props are ex expected to change over time, then we have to consider using life cycle method or book to update the state in response to prop change.

Okay, so to apply the SOLID principle in FullStack Laravel or React application, here I would like to talk about the Laravel application. So in the Laravel application, first I will use the SRP, which means Single Responsibility Principle, that means each class should have only one reason to change, meaning it should only have one job. So in Laravel, we have to separate the logic into different classes based on their functionality. For example, controllers should only handle the ITP request and delegate business logic to service classes. Then I can also use the Laravel jobs for background tasks, processing, and even for handling the side effects of the main action. And then OCP means Open Close Principle, so the software entity should be open for extension but closed for modification. Then we can use the LSP, which means Lisco Substitution Principle, so the object of a subclass should be replaced with objects of subclass without affecting the correctness of the program. And then we can use the ISP, which means Interface Aggregation Principle, so in which clients should not be forced to depend upon interfaces they do not use. Then the DAP, which means Dependency Inverter Principle, which means high-level modules should not depend on low-level modules, both should depend on abstraction. Abstractions should not depend on details, so the details should depend upon the abstractions. So by using this, we can use the SOLID principle in Laravel application, and here we can also consider by creating service provider using middleware, employing resource controller, utilizing form request, using EloCount, implementing policies, and writing features, and you need to ensure the Laravel code behavior.

Okay. so to improve the performance, to enhance the performance of a re React app with a heavy visual elements, I can use the lazy loading. So for that, we have to use dynamic input syntax or, like, or, like, libraries like a create lazy load to lazy load components. And, then the code splitting so it's so that will split the application into smaller sense using Webex, or parcel with which offer loading only the necessary code at the start and the rest of the month. And then we can be using the pure component and the debug dot memo. So this can prevent un unnecessary re unnecessary re renders by Celo comparing props or stack. And then and then we can use op optimizing renders with should component update. So it will implement this lifecycle method to our un unnecessary render when the state or props haven't changed significantly. And then we can then we can use then we can use the virtualization. So for that, we have to use the you use the libraries like react window or virtualize to only to only render items that are currently that are currently visible in the viewport. And then we can use the throttling and debouncing even in that. So for continuous event like scrolling or resizing, we can use throttling. We can use throttling or debouncing to limit the number of times, the events handler are called. And then we can use the, mhmm, and then we can use the Canvas drawing. Then another one is the and then the then the then the another one is the web workers. and then we can also use the c s a transition and animation. We can use the, we can use the immutable data structure. And then we can also use the profiling and optimizing component. And then we can reduce the bundle size. And then, also, we can use the SSR, which is server side rendering. And, then we can prioritize, and then we can prioritize loading. So in that way, we have to use the link tag and the real is equal to preload. And then we can, you use the state management optimization.

No. Okay. So the testing complexity component interaction in web application using Jest, I have to set up the testing environment. So first, I will in so first, I so the first, I will install Jest by using the command npm install, save dev Jest. And then I will install the recitation library, NPM install. Save dev at the rate testing at the rate testing library, and take enter a test library for forward slash jest dom. And then I will configure jest. So for that, I will create or update the test.config. Js file. and then, I will set up the test utilities in setup test dot JS file. and then I will I will write the test. so in so in which I will render the component by using the react testing library to render the component. Yeah. Then I will simulate user interaction. Then I will test effects and callback. And then I will use passing operation and API mocks. And, then, I will check the add ons technique, like testing prop change, context providers, or hooks. so the hooks will so the hooks will utilize the texturing library to test the custom hooks. Then I then I will use the performance testing that will use to profiling to understand the component performance with various state and props. Then, I will use the main ability, which is clear test cases. that means we will name the test case clearly and ensure they are focused on specific functionalities. And then we can use the mocks and stubs, you know, by using just smoking function twice a little component for unit testing while stubbing out complex dependency. So by this type of strategies, we can we can effectively test the complexity component interaction that will ensure the app application is, application is bug free and user friendly.