Showing posts with label Coding. Show all posts

Monday, 27 October 2025

Progressive Web Apps (PWAs): How They Work and Browser Integration

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Progressive Web Apps (PWAs): The Best of Web and Mobile

Progressive Web Apps, or PWAs, are revolutionizing the way we interact with the internet. They bridge the gap between traditional websites and native mobile applications, offering a fast, reliable, and engaging user experience. If you've ever wondered how your favorite web services feel just like apps on your phone, you're looking at the power of PWAs.

1. What Exactly is a PWA?

A PWA is essentially a website built using common web technologies (like HTML, CSS, and JavaScript) but designed to provide an app-like experience. They are "progressive" because they work for every user, regardless of browser choice, and "web" because they are hosted on the internet. You don't need to visit an App Store to install them; you can add them directly from your browser.

2. How They Work: Service Workers

The secret sauce behind every PWA is the Service Worker. This is a script that runs in the background, separate from the web page. It handles tasks like caching assets for offline use, background synchronization, and push notifications. This means a PWA can load instantly even on slow networks or work entirely offline!

3. Browser Integration & Manifests

To make a website feel like an app, it uses a Web App Manifest. This is a simple JSON file that tells the browser how your PWA should behave when "installed." It defines things like the app's name, the icons to use on the home screen, and whether the app should open in full-screen mode without a browser URL bar.

4. Why Businesses Love PWAs

For developers and businesses, PWAs are a game-changer:
• Cost-Effective: Build one app that works on Android, iOS, and Desktop.
• Discoverability: They are indexable by search engines like Google.
• Engagement: Push notifications keep users coming back.
• No App Store Friction: Users can install with one tap, skipping the complex store download process.

💡 Tech Tip: Next time you see a "Add to Home Screen" prompt on a mobile site, you're experiencing a PWA! Try it out to see how fast and smooth it feels compared to a standard tab.

Friday, 17 October 2025

Master Cross Browser Testing: Tools & Tips Every Developer Needs

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Cross Browser Testing: Why It's Non-Negotiable

When you build a website, you want it to look and work perfectly for everyone. But here's the reality: your users are on different browsers like Chrome, Firefox, Safari, and Edge, and different devices like laptops, tablets, and phones. A site that looks flawless in Chrome might be completely broken in Safari. This is where Cross Browser Testing comes in—ensuring a consistent, professional, and bug-free experience for every single user.

1. Top Tools for Modern Developers

You don't need to own every device to test your site. Cloud-based platforms allow you to test on thousands of real browser and OS combinations:
• BrowserStack: The industry standard for testing on real devices in the cloud.
• Sauce Labs: Excellent for mobile testing and automated workflows.
• LambdaTest: A user-friendly platform for quick cross-browser checks.
• Local Testing: Don't forget to manually check the browsers installed on your own machine!

2. Essential Tips for Beginners

If you're just starting out, follow these rules to save time and frustration:
• Prioritize Popularity: Start with Chrome, Safari, and Firefox as they hold the most market share.
• Think Mobile-First: More people browse on phones than desktops. Test both iOS and Android.
• Focus on Core Features: Ensure buttons, forms, and navigation menus work before worrying about pixel-perfect design.

3. Why Testing Prevents "Business Leaks"

Imagine an online shop where the "Buy Now" button works in Chrome but is cut off in Safari. Or a payment form that fails to load in Firefox. Without cross-browser testing, these bugs go unnoticed, and you lose customers. Regular testing ensures your layout remains responsive and your features stay functional regardless of browser updates.

💡 Key Takeaway: A professional website is a consistent website. Use automated tools to scale your testing and always keep your mobile users in mind!

Sunday, 2 April 2023

How to Get and Select a Collection and update one document in the collection using Java in MongoDB

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Updating a Single Document in MongoDB Using Java

In database management, being able to modify existing data is just as important as adding new data. Today, we’ll look at the simplest way to update exactly one document in your MongoDB collection using Java.

The 'updateOne' Method

MongoDB provides a specific method called updateOne(). As the name suggests, it targets the first document it finds that matches your search criteria and applies the changes you specify.

Step 1: Define Your Filter

First, you need to tell Java which document to update. You do this using a filter. For example, you might want to find a document where the "id" is 101 or the "name" is "Java Course".

Step 2: Set the New Values

Next, you define what needs to change. Using the Updates.set() method, you can specify a field and the new value you want it to have. This keeps your data accurate and up-to-date!

Step 3: Run the Update

Finally, you call collection.updateOne(filter, update). MongoDB will handle the rest, and you can even receive an UpdateResult to confirm that the change was successful.

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How to Get All Documents from MongoDB Collection in Java

When building an application, you often need to list all the items in your database. In this beginner-friendly tutorial, we'll learn how to use Java to retrieve every single document from a MongoDB collection.

The Basics of Retrieval

In MongoDB, when we want to see everything inside a collection, we use the find() method without any filters. This is like asking the database to "show me everything you've got!"

Connecting Your Collection

First, ensure your Java application is connected to the MongoDB server. You'll need to specify your database and the exact collection you want to read from. Once connected, the find() method returns a special list-like object called a cursor.

Iterating Through Data

Since the database might contain thousands of documents, we use an Iterator or a MongoCursor to go through them one by one. This allows your application to handle the data smoothly without using too much memory.

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Friday, 23 October 2020

MongoDB - Query Document using Not Equals Operation | MongoDB Tutorial for Beginners

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Mastering MongoDB: The Not Equals ($ne) Operator

Welcome back! Today, we are exploring a vital part of data filtering in MongoDB: the Not Equals operation. In database management, finding what you *don't* want is often just as important as finding what you do. This guide will show you exactly how to exclude specific data from your results effortlessly.

What is the "Not Equals" Operation?

The $ne operator (which stands for Not Equal) allows you to filter documents where a specific field does not match a given value. Imagine you have a list of products and you want to see everything except items that are "Out of Stock"—that is where the Not Equals operator shines!

How to Use $ne in Your Queries

The syntax in MongoDB is straightforward. You use the field name followed by the operator in a nested object. Here is a clear example for beginners:

        db.collection.find({ 

          status: { $ne: "shipped" } 

        })

In this case, MongoDB will return every document where the status is anything other than "shipped." It’s a powerful way to clean up your data views!

Why Use $ne?

Efficient Filtering: Quickly remove irrelevant data from your results.
Cleaner Reports: Focus only on the categories that matter for your current task.
Flexibility: Use it with strings, numbers, or even booleans.

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MongoDB Basics: Less Than ($lt) and Less Than Equals ($lte)

In the world of database querying, being able to filter data based on specific ranges is essential. In this guide, we’ll learn how to find documents that fall below a certain value using MongoDB’s Less Than ($lt) and Less Than Equals ($lte) operators.

What do these operators do?

These comparison operators are used to compare numerical values, dates, and even strings. They allow you to fetch documents where a field is "smaller" than your target value.

$lt (Less Than): Matches values that are strictly less than the specified value.
$lte (Less Than or Equal To): Matches values that are less than or exactly equal to the specified value.

How to Write the Query

Using these operators in MongoDB is simple. Here is a basic example showing how to find products that cost less than 100 units:

        db.products.find({ 

          price: { $lt: 100 } 

        })

If you want to include products that are exactly 100, just change the operator to $lte. This logic is widely used for creating price filters, inventory alerts, and date-based reports.

Why Learn This?

Understanding range queries is a fundamental building block for any backend developer. Whether you're building a simple app or a complex enterprise system, these operators help you present the most relevant data to your users.

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Monday, 12 November 2018

Spring AOP - Advice Types | Spring Tutorial

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Exploring Spring AOP Advice Types

In the world of Spring AOP (Aspect-Oriented Programming), "Advice" is the action taken by an aspect at a particular join point. If you want to master how Spring handles cross-cutting concerns, you need to understand the different types of advice available.

1. Before Advice

As the name implies, Before Advice runs right before the method execution. It is commonly used for security checks or logging the start of a process. It cannot stop the method from executing unless it throws an exception.

2. After Returning Advice

This advice executes only after a method successfully completes its execution without any errors. It's great for logging results or post-processing the returned data.

3. After Throwing Advice

If your method runs into trouble and throws an exception, After Throwing Advice steps in. This is perfect for global error handling or notifying an admin when something goes wrong in the background.

4. Around Advice

The most powerful of them all! Around Advice can perform custom behavior both before and after the method invocation. It also has the power to decide whether to proceed to the joint point or to short-circuit the execution entirely.

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