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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.

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intermediateJavaScript Interview Prep Algorithms

The One Line That Makes Longest Consecutive Sequence Linear

Delete the `if (!numSet.has(num - 1))` guard from the standard LeetCode 128 solution and every test still passes, but the inner loop jumps from 31,999 iterations to 511,984,000 at n = 32,000.

AdminSeptember 18, 20266 min read

intermediateJavaScript Heap Algorithms

Task Scheduler: Two Answers That Have To Match

LeetCode 621 has two unrelated correct solutions — a heap simulation and a one-line formula — so running them against every task multiset up to size 14 crossed with every cooldown from 0 to 40 is a stronger test than any example you would write by hand.

AdminSeptember 17, 20266 min read

intermediateJavaScript Interview Prep Algorithms

0/1 Knapsack: What the One-Array Rewrite Costs You

Collapsing the 0/1 knapsack DP table into a single array is taught as a free win, but it destroys the record of which items were chosen and introduces a loop-direction bug that returns a plausible wrong answer on roughly four instances in five.

AdminSeptember 16, 20267 min read

advancedDatabases PostgreSQL Prisma

Two URLs, One Database: What a Pooler Actually Changes

I sent the same query down a transaction-mode pooler and a session-mode one into the same Postgres instance, and wrote down every place the answers diverged.

AdminSeptember 15, 20268 min read

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