- CSS Selectors
A CSS selector is the part of a CSS rule that describes what elements in a document the rule will match. The matching elements will have the rule’s specified style applied to them. There are 5 categories of selectors: Simple selectors (select elements based on name, id, class) Combinator selectors…
- CSS Box Model
All HTML elements can be considered as boxes. In CSS, the term “box model” is used when talking about design and layout. The CSS box model is essentially a box that wraps around every HTML element. It consists of: margins, borders, padding, and the actual content. The image below illustrates the…
- What is Elasticsearch, and When Should You Use One?
Start here. What an inverted index actually does that a database index cannot, the queries that justify running a second datastore, and the ones that do not. The vocabulary you need before anything else makes sense — cluster, node, index, shard, replica, document — and the single most important consequence of the whole design: the index is a derived copy, and treating it as the source of truth is the mistake every other lesson in this track is arranged to prevent.
- Improve Your Coding Skills
Years of experience do not automatically make you a better programmer. I have met developers with a decade on the job who write the same mediocre code they wrote in year two. The difference between a good developer and a great one is deliberate practice — consistently pushing yourself outside your…
- Postgres – Indexes
Every index in this post is created on a 400,000-row table and the plan before and after is shown. B-tree and why column order in a composite index decides whether it is used, partial indexes for the status you actually query, expression indexes for lower(email), covering indexes and index-only scans, GIN for jsonb, and the write cost that makes an unused index worse than no index.