Coding articles to level up your development skills https://www.30secondsofcode.org en-us https://www.30secondsofcode.org/assets/logo.png https://www.30secondsofcode.org 1440 https://www.30secondsofcode.org/git/s/force-push-better-alternative Forced pushes in shared branches are dangerous, but did you know there's a safer alternative? Wed, 28 Jan 2026 00:00:00 GMT https://www.30secondsofcode.org/git/s/list-aliases Did you set up a lot of Git aliases and forgot what they are? List them all with this command. Wed, 07 Jan 2026 00:00:00 GMT https://www.30secondsofcode.org/git/s/aliases Increase your productivity and reduce your cognitive load by creating aliases for many common git operations. Sat, 20 Dec 2025 00:00:00 GMT https://www.30secondsofcode.org/articles/s/explicit-code-is-always-better A thesis on why magic abstractions are harmful to codebases and teams. Tue, 04 Nov 2025 00:00:00 GMT https://www.30secondsofcode.org/articles/s/learnings-from-vibe-coding-a-small-web-project A short summary of your story up to 140 characters long. Fri, 24 Oct 2025 00:00:00 GMT https://www.30secondsofcode.org/js/s/best-time-to-buy-and-sell-stock Have you tried solving "Best Time to Buy and Sell Stock" on LeetCode? Let's take a couple of approaches to tackle it in JavaScript. Thu, 16 Oct 2025 00:00:00 GMT https://www.30secondsofcode.org/articles/s/tech-stack-refactoring-problems Infinite flexibility in your tech stack can lead to refactoring headaches and technical debt. Here's how to avoid the trap. Wed, 08 Oct 2025 00:00:00 GMT https://www.30secondsofcode.org/html/s/speculation-rules-api-first-look The new Speculation Rules API aims to deliver across the board performance optimizations with little developer effort. Let's see how! Mon, 29 Sep 2025 00:00:00 GMT https://www.30secondsofcode.org/articles/s/virtues-of-pair-programming Pair programming can be valuable for junior and senior developers alike, fostering collaboration and knowledge sharing. Sat, 20 Sep 2025 00:00:00 GMT https://www.30secondsofcode.org/js/s/how-to-secure-your-js-code-from-vulnerable-dependencies Keep your code, data, and users safe by following these simple tips to secure your JavaScript projects from vulnerable dependencies. Sun, 14 Sep 2025 00:00:00 GMT https://www.30secondsofcode.org/git/s/fix-incorrect-line-endings Have you ever encountered an issue with incorrect line endings in your git repository? Let's fix it! Mon, 08 Sep 2025 00:00:00 GMT https://www.30secondsofcode.org/js/s/writing-great-code Writing great code is more than writing code that works, requiring discipline and a focus on testability, maintainability, and readability. Tue, 02 Sep 2025 00:00:00 GMT https://www.30secondsofcode.org/articles/s/art-of-debugging-meditation What's the connection between meditation and debugging? Let's find out. Thu, 28 Aug 2025 00:00:00 GMT https://www.30secondsofcode.org/js/s/sudoku-solver-wave-function-collapse Explore how to solve Sudoku puzzles in JavaScript using the wave function collapse algorithm, a constraint-propagation technique. Mon, 25 Aug 2025 00:00:00 GMT https://www.30secondsofcode.org/articles/s/no-code-is-inherently-evil No code tools? No code at all? No code you write? Prepare for a triple entendre that cuts deep into the world of software development. Thu, 21 Aug 2025 00:00:00 GMT https://www.30secondsofcode.org/articles/s/the-frontend-trap How staying on the frontend can limit your career growth and a hot take on how to escape it. Tue, 19 Aug 2025 00:00:00 GMT https://www.30secondsofcode.org/js/s/deep-clone-structured-clone Learn how to deep clone objects in JavaScript using structuredClone, and how it compares to other cloning methods. Thu, 14 Aug 2025 00:00:00 GMT https://www.30secondsofcode.org/js/s/undirected-tree-degree-min-height-tree Using the degree of nodes, we can employ a very efficient algorithmic trick to find the minimum height tree in an undirected tree in JavaScript. Thu, 07 Aug 2025 00:00:00 GMT https://www.30secondsofcode.org/js/s/undirected-tree-diameter Using a two-pass DFS approach, we can efficiently find the diameter of an undirected tree in JavaScript. Thu, 31 Jul 2025 00:00:00 GMT https://www.30secondsofcode.org/js/s/undirected-tree-bipartite-coloring Learn how to apply bipartite coloring to an undirected tree in JavaScript, ensuring that no two adjacent nodes share the same color. Thu, 24 Jul 2025 00:00:00 GMT https://www.30secondsofcode.org/js/s/undirected-tree-dfs-bfs Learn how to traverse an undirected tree using Depth-First Search (DFS) or Breadth-First Search (BFS) in JavaScript. Thu, 17 Jul 2025 00:00:00 GMT https://www.30secondsofcode.org/js/s/undirected-tree-from-edges Learn how to build an undirected tree from an array of edges in JavaScript, with various approaches for storing node relationships. Thu, 10 Jul 2025 00:00:00 GMT https://www.30secondsofcode.org/js/s/binary-number-conversion Binary numbers are a fundamental part of computer science. Learn how to convert between binary and decimal numbers in JavaScript. Mon, 07 Jul 2025 00:00:00 GMT https://www.30secondsofcode.org/articles/s/how-30-seconds-of-code-is-deployed A historical run-through of how 30 seconds of code was deployed then and now. Thu, 03 Jul 2025 00:00:00 GMT https://www.30secondsofcode.org/js/s/indexed-object-collections Using indexes can speed up querying object collections significantly, but it seems like a black box for many. Let's dive in! Sat, 28 Jun 2025 00:00:00 GMT https://www.30secondsofcode.org/js/s/longest-palindrome While a brute-force longest palindrome finder is simple, it is not efficient. Let's explore a more efficient solution. Mon, 23 Jun 2025 00:00:00 GMT https://www.30secondsofcode.org/js/s/binary-search-insert-index-sorted-number-array Combining techniques presented in the past, we can solve a more complex problem with stellar performance. Thu, 19 Jun 2025 00:00:00 GMT https://www.30secondsofcode.org/js/s/digitize-number Learn how to convert any number to an array of digits, as well as how to sum the digits and compute the digital root efficiently. Sun, 15 Jun 2025 00:00:00 GMT https://www.30secondsofcode.org/articles/s/design-systems-reality Design systems are often seen as the holy grail of design and development, but there are a few issues that can arise in the real world. Sat, 14 Jun 2025 00:00:00 GMT https://www.30secondsofcode.org/js/s/sudoku-validator Sudoku is a logic-based combinatorial number-placement puzzle. This article discusses how to implement a Sudoku validator in JavaScript. Wed, 11 Jun 2025 00:00:00 GMT https://www.30secondsofcode.org/articles/s/markdown-cheatsheet Markdown is the most popular markup language for writing documentation. Here is a cheatsheet with the most common syntax. Sun, 08 Jun 2025 00:00:00 GMT https://www.30secondsofcode.org/js/s/vocal-fails-silencing-errors Learn why vocal errors are better than silent ones, how to handle them effectively, and improve debugging and collaboration in JavaScript. Wed, 04 Jun 2025 00:00:00 GMT https://www.30secondsofcode.org/js/s/matrix-data-structure After working with 2D arrays for a while, I decided to create a convenient wrapper for operations. Here's the gist of it. Sun, 01 Jun 2025 00:00:00 GMT https://www.30secondsofcode.org/js/s/eslint-prettier-configuration Instead of reconfiguring ESLint and Prettier every time, I use this configuration to get started quickly. Wed, 28 May 2025 00:00:00 GMT https://www.30secondsofcode.org/css/s/details-tabbed-content Leverage modern HTML and CSS capabilities to create a tabbed content component without JavaScript. Mon, 26 May 2025 00:00:00 GMT https://www.30secondsofcode.org/html/s/details-accordion Did you know you don't need JavaScript to create accordion-style content? Here's how to do it with the details element. Thu, 22 May 2025 00:00:00 GMT https://www.30secondsofcode.org/css/s/text-centering-line-block In the age of flexbox and grid, text alignment may seem simpler than ever, but there are a few things you should be aware of. Mon, 19 May 2025 00:00:00 GMT https://www.30secondsofcode.org/css/s/inset The inset shorthand property makes element positioning in CSS easier. Learn how to use it effectively in your projects. Thu, 15 May 2025 00:00:00 GMT https://www.30secondsofcode.org/css/s/logical-physical-properties-map New to CSS logical properties? This article provides a handy map of logical properties to their physical counterparts. Mon, 12 May 2025 00:00:00 GMT https://www.30secondsofcode.org/articles/s/code-modularization Have you ever stopped to wonder if modularization is right for your use case? What if I told you it might not be? Sat, 10 May 2025 00:00:00 GMT https://www.30secondsofcode.org/js/s/operator-cheatsheet Quick reference for JavaScript operators. Wed, 07 May 2025 00:00:00 GMT https://www.30secondsofcode.org/js/s/progressive-enhancement-web-components Dive into Web Components with me and learn how I used them to create modular interactive components to progressively enhance my website. Sat, 03 May 2025 00:00:00 GMT https://www.30secondsofcode.org/js/s/n-gram-fuzzy-matching Having built a search engine with TF-IDF and inverted indexes, we will now implement fuzzy matching to make searching error-tolerant. Tue, 29 Apr 2025 00:00:00 GMT https://www.30secondsofcode.org/js/s/relative-time-formatting Did you know JavaScript has a built-in way to format relative time? It's called Intl.RelativeTimeFormat and it's awesome! Thu, 24 Apr 2025 00:00:00 GMT https://www.30secondsofcode.org/js/s/browser-os-detection Learn how to easily detect the user's operating system in the browser using JavaScript. Sat, 19 Apr 2025 00:00:00 GMT https://www.30secondsofcode.org/js/s/partial-search-matching Building on top of the TF-IDF and inverted index implementation, we will implement partial search matching to make searching more robust. Mon, 14 Apr 2025 00:00:00 GMT https://www.30secondsofcode.org/js/s/tf-idf-inverted-index Building on top of the Porter stemmer, we'll explore how to use TF-IDF and an inverted index to implement a search algorithm in JavaScript. Wed, 09 Apr 2025 00:00:00 GMT https://www.30secondsofcode.org/js/s/porter-stemming-algorithm Learn how to implement the Porter stemming algorithm in JavaScript, a simple algorithm for stripping English words of common suffixes. Sun, 06 Apr 2025 00:00:00 GMT https://www.30secondsofcode.org/js/s/event-driven-vanilla-js-signals Let's demystify signals and reactivity, one of the most popular patterns in modern JavaScript, using event-driven programming! Wed, 02 Apr 2025 00:00:00 GMT https://www.30secondsofcode.org/js/s/tdd-codebase-refactoring In the last installment of the series, we'll refactor our codebase to reduce bundle size and complexity, while making it more maintainable. Fri, 28 Mar 2025 00:00:00 GMT