Vaibhav Acharya, engineer.

How GitHub Actions proves which repository an upload comes from, without a stored API key.

An answer can reach more people while the person who found it loses their audience.

A teammate asked if Skills replace MCP.

TCP is a reliable byte stream, UDP is fire-and-forget messages.

What you get when you rebuild TCP's reliability on top of UDP in user space, and drop the parts that hurt.

Every HTTP version exists to fix the bottleneck the last one created.

We build tools to stay beneath us and children to surpass us.

Monads in plain JavaScript: Maybe, map, chain, Promise, and why the weird box thing turns out to be useful.

Signals, effects, and computed values built from scratch in plain JavaScript

LRU, LFU, TTL, write-through, write-back, and cache stampedes explained with interactive demos

The scope chain drawn out, then closures at work as private counters and run-once functions, with the var loop and memory traps.

Array.prototype.sort explained, custom comparators, and stability quirks

Pure functions, immutability, higher-order helpers, reduce and composition, ending in a small project that uses all of them.

Map, forEach, filter, reduce explained from scratch