Visualizers
Learn by moving things
Interactive explainers for the ideas behind retrieval, embeddings, and agents. A formula tells you what is true; dragging a vector shows you why. Each one also appears inside the article it belongs to, and runs entirely in your browser, so drag, poke, and break it.
Where caches live
From: Caching: Don't Do the Same Work Twice →Like looking for your keys, a request checks the closest cache first: browser, then CDN, then app cache, then the database. The closer the hit, the faster, and a full miss pays the slow price.
The browser already has it: instant, no network at all.
Cache-aside: the hit and the miss
From: Caching: Don't Do the Same Work Twice →Check the cache first. The first request misses and takes the slow trip to the database, filling the cache on the way back; every request after is a fast hit. Watch the hit ratio climb.
First request: the cache is empty, so it misses and takes the slow trip to the database, then drops a copy in the cache on the way back.