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Introduction Skip lists are a beautiful idea: a simple, probabilistic alternative to balanced trees that delivers expected O(log n) search, insert, and delete, yet is easier to implement and friendlier to concurrency. They’ve quietly powered critical systems for decades—from leaderboards and rate limiters to LSM-tree memtables and Redis sorted sets. In this post, you’ll go from beginner to hero: Understand the intuition, guarantees, and design of skip lists Implement a production-quality skip list in Python Learn how skip lists show up in system design Get practical guidance on performance, determinism, and trade-offs Explore advanced variants and when to use them If you’re building systems that need fast ordered access, range queries, or rank-based operations, skip lists belong in your toolkit. ...

Batching API requests is a proven technique to improve throughput, reduce overhead, and tame the N+1 request problem across web and mobile apps. But batching is more than “combine a few calls into one.” To do it well you need to consider protocol details, error semantics, idempotency, observability, rate limiting, and more. This article explains how batching works, when to use it, and how to design and implement robust batch endpoints with real code examples. ...

Introduction GitHub Pages is a fantastic starting point for static sites. But as your needs grow—zero-downtime deploys, branch previews, global edge performance, custom headers and redirects, or serverless functions—you might want to graduate to Cloudflare Pages. In this step-by-step guide, you’ll learn how to migrate cleanly from GitHub Pages to Cloudflare Pages with minimal or zero downtime, while preserving SEO, URLs, and performance. We’ll cover: Preparing your repository (Jekyll/Hugo/Eleventy/Next/Astro/etc.) Configuring Cloudflare Pages builds and environments Switching DNS with no downtime Preserving links via redirects and canonical URLs Handling SPA routing, caching, headers, and forms Rollbacks, previews, and common pitfalls If you follow along, you can ship your site on Cloudflare Pages the same day. ...

Introduction Cross-Origin Resource Sharing (CORS) is one of the most misunderstood parts of modern web development. It sits at the intersection of browsers, HTTP, and security, and when it goes wrong you often see opaque errors like “CORS policy: No ‘Access-Control-Allow-Origin’ header…”. This guide takes you from zero to hero: you’ll learn the mental model behind CORS, how the browser enforces it, how to configure servers correctly across popular stacks, how to optimize performance, and how to avoid common security pitfalls. ...

Introduction Expo Go is a cornerstone tool in the React Native ecosystem, enabling developers to build, test, and iterate on mobile apps rapidly without the overhead of compiling native code for every change. This tutorial dives deeply into how Expo Go works internally, revealing the architecture, workflows, and limitations that make it such a unique and powerful tool for mobile app development. By understanding Expo Go’s inner workings, you will better leverage its capabilities, troubleshoot issues, and know when to transition to custom development builds. ...