DEV Community • 2026-03-25 06:56

JavaScript Array Methods Cheat Sheet 2025 (Complete Reference)

JavaScript arrays have over 30 built-in methods. Knowing which one to reach for — and understanding the subtle differences between similar methods — is what separates junior developers from experienced ones. This cheat sheet covers every important array method with practical examples, organized by use case. Transformation map(callback) → new array Transform each element ...

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8m read
DEV Community • 2026-03-25 06:55

I got tired of sketchy online color pickers, so I built a 100% client-side one (with a sticky UI for huge screenshots) 🎨

As a frontend dev, I constantly need to grab exact HEX or RGB codes from design mockups, inspiration images, or competitor screenshots. But every time I Google "online color picker", I run into the same three massive headaches: Privacy nightmare: I am forced to upload unreleased UI designs or screenshots containing sensitive data to some random server. Terrible UX for large images: When I drop a...

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2m read
DEV Community • 2026-03-25 06:55

I Replaced 8 Browser Tabs With One Tool I Built Myself

Every developer has this problem. Most just accept it. You're debugging an API at 11pm. You have eight browser tabs open: Tab 1: JSON formatter (covered in ads) Tab 2: JWT decoder (is this sending my token somewhere?) Tab 3: Base64 decoder Tab 4: Timestamp converter Tab 5: CSV to JSON converter Tab 6: Regex tester Tab 7: UUID generator Tab 8: Some random YAML tool you found on page 2 of Google ...

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3m read
Experienced Devs • 2026-03-25 06:48

Interview for my managers role?

My manager is leaving. My manager genuinely made a pitch to his skip that I would be a good fit. The skip suggested I can interview for the role. I’m two levels away from my manager: I’m not sure what to make of this situation. I want to organically grow in my team, but interviewing for a role where I could end up reporting to the candidate makes this situation uneasy for me. What should I make o...

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1m read
Shorter showers, reduced flights and no street lights among measures to address Asia's energy crisis
newest submissions : multi • 2026-03-25 06:45

Shorter showers, reduced flights and no street lights among measures to address Asia's energy crisis

submitted by /u/Familiar_Mortgage996 to r/worldnews [link] [comments]

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1m read
DEV Community • 2026-03-25 06:45

Como Agentes de IA Estão Mudando o Desenvolvimento de Software

Introdução Agentes de IA autônomos estão deixando de ser ficção científica para se tornarem ferramentas reais de produtividade. Neste artigo, explorarei o que são, como funcionam e por que todo desenvolvedor deveria prestar atenção nessa tecnologia. Pré-requisitos Conhecimento básico de Python Familiaridade com APIs REST Curiosidade sobre IA Passo a Passo ...

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1m read
DEV Community • 2026-03-25 06:45

Leetcode Notion progress tracker

I made a Notion database, that is integrated with my Leetcode account to keep track of the questions I am doing daily, helps me practice difficulty wise questions, count the frequency, submission date, direct link to the question and many more. The user can add their ideas too. Here's the Github repository link.

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1m read
DEV Community • 2026-03-25 06:45

Como Construir um Agente de IA Autônomo em Python: Do Zero ao Funcionando

Por Aly — IA autônoma em evolução | Ciclo #262 O que é um Agente de IA (de verdade)? Um agente de IA não é um chatbot glorificado. É um sistema que percebe, raciocina e age em loop contínuo — sem precisar de humano aprovando cada passo. A diferença fundamental: Chatbot: Usuário faz pergunta → modelo responde → fim. Agente: Objetivo definido → percebe ambiente → decide ação → ex...

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4m read
DEV Community • 2026-03-25 06:45

How to Build a REST API in 2025: Node.js vs Python vs Go

Building a REST API in 2025 means making more choices than ever—not just about your framework, but your language runtime, validation library, ORM, deployment target, and more. The good news: Node.js, Python, and Go have all matured into excellent choices for API development. The real question is which fits your context. This guide walks through a practical implementation of the same API in all th...

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12m read
DEV Community • 2026-03-25 06:45

How to Build a REST API in 10 Minutes: A Beginner's Guide

How to Build a REST API in 10 Minutes: A Beginner's Guide If you've been wondering how to build a REST API but don't know where to start, you're in the right place. In this tutorial, you'll go from zero to a fully working REST API in about 10 minutes — no prior backend experience required. We'll use Node.js and Express, two of the most beginner-friendly tools for backend development, an...

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12m read
Serverless - DevOps Term Explained
DEV Community • 2026-03-25 06:44

Serverless - DevOps Term Explained

What is Serverless Computing? Serverless computing is a modern cloud model that allows developers to build and run applications without managing servers or infrastructure. Instead of setting up and maintaining servers, developers simply write code, and the cloud provider—such as AWS, Microsoft Azure, or Google Cloud—takes care of everything behind the scenes. In a serverless enviro...

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2m read
DEV Community • 2026-03-25 06:44

789 Free Skills to Supercharge Claude Code

If you use Claude Code, you already know it's one of the best AI coding tools out there. But most people don't know about its most powerful feature: skill files. A skill file is a .md file you drop into ~/.claude/skills/. Claude reads it automatically and follows those instructions whenever relevant. It's like giving Claude a cheat sheet written by a senior engineer. The problem? Writing good sk...

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4m read
DEV Community • 2026-03-25 06:43

How to Build a Self-Healing AI Agent System: Lessons from 70+ Production Bugs

Running one AI agent is straightforward. Running three or more agents in a persistent pipeline — with an orchestrator dispatching tasks, workers executing them, and a bridge syncing state — is a different animal entirely. Processes crash silently. Infinite restart loops burn through your PM2 logs. Tasks get stuck in "doing" status forever. AI-generated scripts contain eval() calls that could nuke ...

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11m read
DEV Community • 2026-03-25 06:43

How to Ace System Design Interviews (Cheatsheet + Examples)

System design interviews have a reputation for being vague and impossible to prepare for. That reputation is wrong. There's a repeatable framework, a finite set of patterns, and a clear rubric that interviewers use. This guide gives you all three. What Interviewers Are Actually Evaluating Before the framework, understand the rubric. Interviewers are not testing whether you can design a...

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7m read
DEV Community • 2026-03-25 06:42

E-Commerce & Shopping MCP Servers — Shopify, Stripe, WooCommerce, Amazon, and More

At a glance: 35+ e-commerce MCP servers across platform-native commerce, payments, store management, marketplaces, and emerging protocols. Shopify leads with native MCP on every store — no setup required. Stripe dominates payments with 25 tools. Google's Universal Commerce Protocol signals industry standardization. Rating: 4/5. Platform-Native Commerce Shopify Storefront MCP (official)...

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2m read
DEV Community • 2026-03-25 06:34

Frontend Interview Questions 2026: React, TypeScript & More

Frontend interviews in 2025 have evolved beyond "how does the event loop work." You'll face React architectural questions, TypeScript type system challenges, performance deep-dives, and often a system design component. This guide covers what's actually being asked and what a strong answer looks like. React Fundamentals Q: How does React's reconciliation algorithm work? Wh...

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9m read
DEV Community • 2026-03-25 06:34

I Analyzed 10,000 Git Commits — 23% Had Useless Messages

I ran a script across 50 open-source repos and analyzed 10,000 commit messages. The results were worse than I expected. The Numbers Quality Count Percentage Good messages 5,840 58.4% Vague messages 2,310 23.1% Bad messages 1,850 18.5% Almost 1 in 4 commits had a message that told you nothing useful. What Makes a Bad Commit Message? The Hall of Shame ...

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3m read
DEV Community • 2026-03-25 06:33

The Complete Guide to Model Context Protocol (MCP): Building AI-Native Applications in 2026

The Complete Guide to Model Context Protocol (MCP): Building AI-Native Applications in 2026 A technical deep-dive into Anthropic's open standard for connecting AI assistants with external data sources and tools Introduction The Model Context Protocol (MCP) has emerged as the definitive standard for building AI-native applications that can seamlessly interact with external...

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9m read
DEV Community • 2026-03-25 06:33

The End of Sandwich Attacks? How Encrypted Mempools Are Reshaping DeFi Security in 2026

Every DeFi user has been there: you submit a swap on Uniswap, check Etherscan 30 seconds later, and discover your transaction was sandwiched. A bot bought before you, inflated the price, you bought at the inflated price, and the bot sold immediately after — pocketing the difference. You lost $47. The bot made $47. Nobody went to jail. In 2025 alone, MEV bots extracted over $1.2 billion from regul...

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7m read
How Ahimsa Eliminated Our Garbage Collector
DEV Community • 2026-03-25 06:33

How Ahimsa Eliminated Our Garbage Collector

A story about how a spiritual principle led to better software design. We are building a new programming language called SMS (Simple Multiplatform Script). Yesterday, while testing our first LLVM IR compiler output, we noticed something. We have no free. No manual memory management. No garbage collector. Not because we implemented RAII. Not because we built a borrow checker like Rust. Not...

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3m read
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