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// From today's article

function learn() {

const skills = [

"JavaScript",

"React",

"Next.js",

];

return skills.map(mastery);

}

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Latest Articles

Expert insights on DSA, system design, interview prep, and modern development.

beginner

Load Balancer vs API Gateway

AdminJanuary 6, 20264 min read

JavaScript Proxies: The Most Underrated Power Tool

AdminJanuary 5, 20261 min read

advancedSystem Design Distributed Systems Backend

If Your CRDT Test Ends by Syncing Everyone, It Tests Nothing

A list CRDT has one job — converge — so you can brute-force it: 400 operation logs, every one of the 720 delivery orders each, diff the results. Three orderings broke the naive implementation in three different ways, and one of them left every replica in perfect agreement about a scrambled document.

AdminAugust 11, 202613 min read

intermediateSystem Design Hashing Performance

The formula said 1.0039%. Ten million queries said 1.0056%.

A Bloom filter's error rate is one of the few things we teach that you can actually check, so I built one, inserted 500,000 keys, queried it with ten million keys that were not in it, and compared the result against the textbook formula at seven different sizings.

AdminAugust 11, 202613 min read

intermediateJavaScript TypeScript Algorithms

Do [1,4] and [4,5] Overlap? Answer That First

LeetCode 56 merges [1,4] and [4,5]; LeetCode 435 says they do not overlap at all. Closed versus half-open ends is the one real decision in interval problems, and most interval bugs come from never making it.

AdminAugust 11, 20268 min read

intermediateSecurity Next.js Express

Content Security Policy, Broken Four Times

The British Airways skimmer sat in a first-party file, so no host allowlist, no 'self' and no nonce would have stopped it — here is one CSP header tightened four times, broken after each round against the CSP Level 3 matching algorithms, until only the directive nobody writes first is left holding.

AdminAugust 11, 202612 min read

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