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ProgrammingDEV Community ·

Building TimeZoneCal: An Ultra-Fast, Zero-Dependency Timezone and Meeting Suite with Astro, Tailwind CSS v4, and Native JavaScript

Managing international timezones, coordinating distributed engineering teams, and debugging epoch timestamps remain persistent challenges in modern software development. While many timezone calculators exist, most are cluttered with heavy third-party bundle sizes, dated user interfaces, and inaccurate Daylight Saving Time (DST) calculations. In this article, we examine the architecture, engineering decisions, and implementation details behind TimeZoneCal (timezonecal.com)—a high-performance, zero-dependency web application built with Astro 6, Tailwind CSS v4, and native browser JavaScript. Whe

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ProgrammingDEV Community ·

Python List Comprehension Examples Explained

A Python list comprehension builds a new list in one line by writing [expression for item in iterable], with an optional if at the end to filter items. It replaces the "make an empty list, loop, append" pattern. Below are the list comprehension examples I actually use, from the basic form to filtering, if/else, nested loops and the mistakes that tripped me up. When I started learning Python, comprehensions looked like a puzzle. Once I learned to read them out loud, they became one of my favourite parts of the language.

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ProgrammingDEV Community ·

Python f-Strings: Formatting Examples

To format a string in Python, put an f before the quotes and write any variable or expression inside curly braces, like f"Hello {name}". Add a colon and a format spec to control how the value looks, for example f"{price:.2f}" for two decimal places. This guide collects the f-string formatting examples I reach for most: numbers, alignment, dates, debugging and the newer features in Python 3.12 and 3.14. Before f-strings, I was gluing strings together with + and str(), which got messy quickly. F-strings fixed that.

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ProgrammingDEV Community ·

HTML Semantic Tags Explained With Examples

HTML semantic tags are elements whose names describe what their content is, not how it looks. , , , , , and tell browsers, screen readers and search engines what each part of the page is for, while a tells them nothing. In this post I explain each semantic tag with examples, show how I structure a real page, and list the mistakes I made when I first started using them. When I built my first websites, every box was a with a class name. The pages looked fine, but the HTML didn't describe anything.

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ProgrammingDEV Community ·

JavaScript Async/Await Tutorial for Beginners

Async/await is a cleaner way to work with promises in JavaScript. Mark a function with async, then put await in front of a promise to pause that function until the promise settles, and use try/catch to handle errors. Your asynchronous code ends up reading top to bottom like normal code. In this async/await tutorial I start from the basics and work up to running tasks in parallel, using fetch safely, retrying and the mistakes I made along the way. All examples are ES modules (.mjs files) that I ran with Node.js 20, and the comments at the end of each block show the real output.

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ProgrammingDEV Community ·

HTML Form Input Types and Validation

HTML gives you built-in form validation without any JavaScript: pick the right type on each (like email, url, number or date) and add attributes such as required, minlength, maxlength, min, max, step and pattern. The browser then blocks submission and shows a message until the values fit. In this guide I go through the input types and validation attributes I use, with examples I checked in a current Chrome build, plus the gotchas that caught me out. One thing to say right away: browser validation is there to help the user. It's not security.

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ProgrammingDEV Community ·

CSS Flexbox vs Grid: When to Use Each

The short answer to CSS Flexbox vs Grid: use Flexbox when you're lining things up in one direction, a row or a column, and want the content to decide the sizes. Use Grid when you need rows and columns at the same time, or when the layout should decide where things go. Most real pages use both: Grid for the overall layout and card lists, Flexbox for the small pieces inside them. Below I show how I decide, with code you can copy, plus the mistakes I made while learning both. I used to pick one at random and fight it until the layout worked.

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ProgrammingDEV Community ·

CSS Position Explained: Absolute vs Relative

CSS position decides how an element is placed. relative nudges an element from its normal spot but keeps its space in the layout; absolute takes it out of the layout and places it relative to the nearest positioned ancestor; fixed pins it to the viewport; and sticky acts normal until you scroll past a threshold, then sticks. The trick most beginners miss is that absolute needs a parent with position: relative. In this post I explain all five values with examples, and every behaviour I describe was checked by measuring elements in headless Chrome. Positioning confused me for a long time.

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ProgrammingDEV Community ·

JavaScript map, filter and reduce Explained

In JavaScript, map() transforms every item in an array and returns a new array of the same length, filter() returns a new array with only the items that pass a test, and reduce() combines all the items into a single value, like a total or an object. None of them change the original array. Below I explain each one with practical examples, show how to chain them, and cover the mistakes that cost me the most debugging time. Every example was run with Node.js 20 (and Node 22 for Object.groupBy), and the comments at the end of each block are the real output. The methods work the same way in every m

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ProgrammingDEV Community ·

PHP Form Validation and Sanitization Guide

To validate and sanitize a PHP form safely: read each field from $_POST with a default, trim() it, check it against clear rules with functions like filter_var(), mb_strlen() and an allow-list, collect the errors in an array, and only use the data when there are none. Then escape every value with htmlspecialchars() when you output it into HTML, and use prepared statements when you store it. In this guide I build a complete contact form handler step by step on PHP 8.4, including CSRF protection and the Post/Redirect/Get pattern. When I started with PHP, I thought "sanitizing" meant running every

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ProgrammingHacker News ·

Show HN: Our space game has a built-in RISC-V emulator that runs Linux

We're a tiny indie studio, all with a background in the demoscene and for about 3 years now we're developing a space planet terraforming game called SEEDS - Echoes Beneath the Sands. Our protagonist Naxiah is stranded on a small, desolated planet. You're working for an intergalactic distributor of seeds and terraforming equipment, to kickstart new planets in far away galaxies. You must deliver seeds and utilities to an unchartered region, but on your way, you crash on a small planet. Luckily, you have some equipment with you in the ship, so you're able to spawn a base and survive.

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ProgrammingDEV Community ·

Secure Your ChatGPT Plugins: 2024‑2026 Playbook

Securing ChatGPT Plugins: A Practical Playbook for 2024‑2026 Introduction The moment OpenAI opened its plugin ecosystem in June 2024, security alarms started ringing. Within weeks, Google Trends showed a 120 % jump in searches for “ChatGPT plugin security,” and by October 2026 the news cycle was dominated by credential‑leak scandals that exposed API keys, OAuth secrets, and internal endpoints. If you’re building—or already running—a ChatGPT plugin, you can’t afford to treat security as an afterthought. This guide walks you through the plugin architecture, real‑world vulnerabilities discovered

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ProgrammingDEV Community ·

Protege tus plugins de ChatGPT: guía práctica y actualizada

Seguridad de plugins de ChatGPT : cómo proteger tus integraciones desde la apertura del ecosistema (junio 2024) Introducción Desde que OpenAI abrió el marketplace de plugins en junio 2024, el número de búsquedas “ChatGPT plugin security” se ha disparado un 120 % y, en octubre 2026, varios incidentes de filtración de credenciales pusieron en evidencia lo frágil que puede ser una integración mal configurada. Si tu empresa ya usa o planea usar plugins para conectar ChatGPT con APIs internas, este artículo te muestra, paso a paso, cómo auditar, endurecer y automatizar la seguridad de esas extensio

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ProgrammingDEV Community ·

Normalizing 30 Judges Without Lying About It: the maths, a counterintuitive k, and what I chose not to build

TL;DR. I built Rubrica, a self-hosted hackathon portal, for DOGFOOD 2026. The interesting part is not the feature list. It is a judging engine whose maths you can verify by hand, one result I am uncomfortable with but kept, a parameter (k) that behaves the opposite of what you would guess, and a list of things I refused to build, with reasons. Repo: https://github.com/aanushiya170/rubrica · Python 3.12 · FastAPI · SQLite · one container · MIT Fixture 41 projects, 30 judges, 8 tracks, 40 teams, 126 scores Acceptance checker 7 checks, all T1/T2 My extra checker 31 live HTTP checks (T3 12/12, T4

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ProgrammingDEV Community ·

ISOM-R2: Streaming 1,055,402 Tokens on 3.24 GB Peak VRAM

Standard Transformer attention has a memory problem at scale. For a 1.05 million-token context with 28 layers, 2 KV heads, and a head dimension of 128, the FP16 Key-Value cache alone requires: 2 × 28 × 2 × 128 × 1,055,402 × 2 bytes ≈ 28.2 GiB That is before loading a single model weight. On a 40 GB A100, the KV cache would consume over 70% of total available memory. On consumer GPUs, it simply crashes. ISOM-R2 (Isometric State Space / Virtual SVD) is a new-gen recurrent memory architecture built to solve this directly.

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ProgrammingDEV Community ·

1200 free calculators on a static site: notes on client-side SEO

I have spent the last few months building CalcProMaster, a free library of 1200+ online calculators: loan EMI, mortgage, compound interest, BMI, percentage, GPA, unit conversion and a lot more. Here is what actually mattered while building it. No signup, no paywall, no usage limit. Every calculator must show the formula and the full working, not just a number. Everything runs in the browser, so there is no per-calculation server cost.

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ProgrammingDEV Community ·

How to solve: Leetcode#22 Generate parentheses

LeetCode — 22. Generate Parentheses Given n pairs of parentheses, generate all combinations of well-formed parentheses. This is one of those problems where the final solution can look almost suspiciously simple: if (closeUsed generateParenthesis(int n) { final res = []; final List stack = [ ('', 0, 0), ]; while (stack.isNotEmpty) { final (cur, openUsed, closeUsed) = stack.removeLast(); if (openUsed == n && closeUsed == n) { res.add(cur); continue; } if (openUsed addIfValid(combination, result) ) return result Then: explorePossibleCombination(n, onFound): ... and: addIfValid(combination, result

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ProgrammingDEV Community ·

I stopped letting my agents guess ports

Run three Claude Code sessions at once and you know this feeling: the API server was on 3000, now it's on 3001, now something else grabbed 3001 and Vite jumped to 5174. Then an agent curls the wrong port, gets ECONNREFUSED, and confidently starts "fixing" code that was never broken. I kept watching this failure mode in the r/ClaudeCode thread asking how people keep multiple sessions organized (89 points, 157 comments at the time of writing). Lots of session-panel tools. Almost nobody talking about the dumber problem underneath: port numbers are the wrong handle for a service.

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