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Code like an Onion: The Decorator Pattern

The Decorator Pattern provides a way of enhancing code without complex inheritance structures, offering a flexible alternative to subclassing for extending functionality.
It wraps objects without changing their core interface, allowing them to be decorated multiple times, similar to peeling layers of an onion.
By applying the Decorator Pattern, developers can separate core business logic from cross-cutting concerns like logging, error handling, and transaction management.
Concrete decorators like OrderProcessor_LoggingDecorator and OrderProcessor_ErrorHandleDecorator handle specific functionalities, allowing core processors to focus solely on business logic.
The order in which decorators are applied matters, with flexibility to conditionally apply them based on specific requirements.
Key benefits include dynamic addition of responsibilities, clean separation of concerns, and the ability to isolate behaviors from core functionality.
Challenges of the pattern include potential debugging difficulties, order dependency for decorators, and the risk of complex interdependencies.
Practical takeaways emphasize maintaining the Single Responsibility Principle, strategic ordering of decorators, and balancing flexibility with clarity.
The Decorator Pattern enhances code maintainability and extensibility, commonly seen in middleware pipelines of modern frameworks like Express.js and .Net Core.
It allows for runtime configuration of object behavior and provides a way to enhance code without altering the core functionality, akin to the layers of an onion.

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Self-Learning-Java

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How to Get Request Content Type in Javalin?

The ctx.contentType() method in Javalin returns the request content type.
To implement this functionality, a Maven project 'javalin-request-body-content-type' is created.
Various classes like JsonUtil, EmployeeRequestDto, and the main application class (App) are defined.
The application handles POST requests to '/employees' endpoint, retrieves content type using ctx.contentType(), and returns a JSON response with the content type.

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Dev

234

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🚀 I Built a Simple Invoice Generator with Astro! [Feedback Welcome]

A developer built a simple invoice generator using Astro and is seeking feedback from the DEV community.
Tech stack used includes Astro for frontend, Vercel for hosting, and FormSubmit for contact form handling.
Project goal was to create a lightweight tool for generating invoices without requiring login/signup, allowing download/print options, and enabling users to upload their company logo.
Features of the invoice generator include adding client and company information, multiple invoice items, auto-calculation of totals and taxes, logo upload, and download/print functionality.

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Self-Learning-Java

408

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Reading Request Attributes as a Map in Javalin

The application demonstrates how to read all request attributes in Javalin.
It includes steps like creating a new Maven project, updating pom.xml with dependencies, defining JsonUtil and main application class.
The main class involves setting up routes to assign attributes and retrieve them as a map, which is then converted to JSON format.
After building and running the application, users can test the API to see the request attributes being displayed.

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24 Likes

Dev

390

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Practical Pydantic: Data Transformation, Aliases, and Validators

Pydantic offers advanced features like custom validators, field aliases, and model configuration for data transformation and validation.
Custom validators in Pydantic enable bespoke validation logic at field or model levels, allowing tasks like trimming whitespace or checking field relationships.
Validators can run pre- or post-validation, useful for data cleaning and enforcing rules after type checking.
Field aliases in Pydantic help map model fields to different keys in input data, essential for working with varied naming conventions.
Model configurations using model_config allow defining model-wide settings like handling extra fields, enforcing immutability, and generating aliases.
Combining defaults, validators, and aliases in Pydantic models leads to robust and adaptable solutions, ideal for API integration.
Best practices include isolating custom logic in validators, utilizing built-in constraints, limiting alias usage, and avoiding in-place mutation.
Common pitfalls to avoid involve excessive use of root validators and not handling None in pre-validators.
Custom validators, field aliases, and model configuration enhance Pydantic's data handling capabilities, offering flexibility and production readiness.

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Dev

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How to Implement Centralized Dark Mode Custom Theme in Tailwind CSS v4

Developers upgrading to Tailwind CSS v4 faced challenges with dark mode customization.
Tailwind CSS v4 makes it easier to manage dark mode, reducing repetitive code and style duplication.
Migrating from v3 to v4 involves updating CSS using the new @theme syntax and defining light and dark mode styles in the same custom theme block.
Troubleshooting steps include ensuring proper class assignment, checking CSS loading order, confirming custom properties support, and using effective media queries for dark mode.

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Self-Learning-Java

Limitations of Simple Prompting in LLMs: Why We Need More Sophisticated Approaches

Simple prompting in LLMs, like generating interview questions on 'Programming Languages', has limitations that may affect relevance and quality of output.
Key limitations include the broad scope of context, leading to questions on various languages, and lack of specific formatting instructions.
Moving beyond simple prompts is essential to leverage generative AI effectively and bridge the gaps in context, precision, and specific instructions.
Advanced prompting techniques can enhance the capabilities of generative AI and revolutionize how we interact with artificial intelligence.

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Self-Learning-Java

408

Creating Advanced Prompts

Working with Large Language Models (LLMs) requires effective prompt engineering to guide them for best results.
The Two Main Steps to Writing Prompts: Creating a detailed prompt for LLMs to understand and continuously improving the prompt based on response.
Moving Beyond the Basics: Understanding why certain prompts work better, testing different prompts for optimal results, and consistently improving prompt quality.
Simple Tips for Writing Great Prompts: Be clear, provide context, experiment with different prompts, and assign roles when necessary for effective communication with LLMs.

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24 Likes

Medium

224

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Comparing Data Annotations and Fluent Validation in .NET Core

Input validation in ASP.NET is crucial to ensure correct, secure, and usable data within applications.
In .NET Core, Data Annotations and Fluent Validation are two primary tools for input validation in MVC applications.
Data Annotations use attribute-based approach for enforcing validation rules, while Fluent Validation offers a more flexible, programmatic way to define rules.
Data Annotations are simpler and integrated tightly with ASP.NET MVC's model-binding and validation pipeline, while Fluent Validation offers greater flexibility and maintainability for complex scenarios.

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4 Likes

Dev

160

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🔁 1128. Number of Equivalent Domino Pairs – Explained with Code in C++, JavaScript, and Python

The problem involves finding the number of equivalent pairs of dominoes in a given list.
The solution involves normalizing the dominoes and using a hash map to efficiently count the pairs.
The optimal solution is implemented in C++, JavaScript, and Python.
The time complexity is O(n), and the space complexity is O(1) due to a fixed array size.

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9 Likes

Dev

161

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Milestone Two: Build 8 Is Here, and It’s a Big One

Tavrn has reached Build 8, marking a significant milestone in their platform development.
New features in Build 8 include a functional server system, real-time messaging, roles, permissions, and server-wide settings.
This update transitions Tavrn from a messaging app to a full-fledged community space, focusing on community interaction and functionality.
While Build 8 introduces major changes, there are additional undisclosed features in the works for future updates.

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9 Likes

Dev

243

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Daily JavaScript Challenge #JS-169: Find the Missing Number in Consecutive Array

Today's JavaScript coding challenge is to find the missing number in a consecutive array from 1 to n.
Developers are encouraged to participate by forking the challenge, writing a solution, and testing it.
Additional resources and documentation on arithmetic progression are provided for learning.
Participants can join the discussion by sharing their approach, interesting edge cases, and learnings in the comments.

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13 Likes

Inside

119

Episode 35 “Stream Gatherers” with Viktor Klang

Ana is joined by Viktor Klang, core JDK architect and author of the Stream Gatherers JDK Enhancement Proposal, to discuss the Gatherers API in JDK 24.
Viktor explains how Gatherers extend the Java Stream API with custom intermediate operations, their significance, and benefits for Java development.
He provides practical tips for effectively using the Gatherer API, shares insights on the design process, and highlights the role of community feedback in shaping JDK features.
Additional resources and links mentioned include JEP 485, The Gatherer API Tutorial, and the Stream Gatherers - Deep Dive with the Expert. Check out Dev.java, OpenJDK, and Oracle Java for more information.

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7 Likes

PlanetPython

202

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Seth Michael Larson: Voicemail for notifications

A discussion on Nagging notifications for mobile applications that don't provide useful information but simply remind the app's existence was seen on Mastodon.
The comparison was drawn with the evolution of landline calls, where the addition of voicemail led to a decreased utility of phone calls and a shift towards text messages for communication with greater responses.
The author mentions how unknown phone numbers going straight to voicemail and the need for better filtering on mobile phones to avoid unnecessary disturbances and improve user experience.
The concept of 'voicemail for notifications' is proposed, suggesting mechanisms for receiving notifications as a daily summary or ability to filter notifications based on patterns.

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12 Likes

Dev

330

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SafePlate AI - Programmatically Post to Facebook

SafePlate AI was developed to assist individuals with food allergies by simplifying meal planning and ensuring food safety.
One of the features added to the product is the ability to programmatically post recipes to Facebook using technologies like Google Cloud Platform, Ionic, NestJS, and Vertex AI.
To post to Facebook, prerequisites like registering as a Facebook Developer, obtaining necessary permissions, and generating Page Access Tokens are required.
Common pitfalls and best practices when posting to Facebook Pages programmatically include permissions, access tokens, deprecations, rate limits, and error handling.

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