Retrieval-augmented generation, or RAG, is a pattern where an application retrieves relevant source material and adds it to a model prompt so the model can answer from that context. A larger context window in a RAG system shouldn’t be treated as a substitute for good context management, although it can make the experience more forgiving […]
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If you’ve spent enough time in the React ecosystem, you’ll have likely seen codebases where nearly every function is wrapped with useCallback and the computed value is wrapped with useMemo. The reason behind this is “memoization equals better performance”. But most of the time, this doesn’t really translate to better performance, and it often produces […]
If you’re looking to level up your front-end development skills by building a practical web utility, this is the guide for you. We’ll code a fully functional Case Converter Tool from scratch using only HTML, CSS, and vanilla JavaScript. This lightweight application allows users to paste their content and immediately transform it into standard formats […]
Dart backend frameworks exist on a spectrum. At the minimal end sits Shelf, with raw primitives and full control. You wire everything yourself. At the maximal end sits Serverpod. It’s a full framework with code generation and opinionated conventions. The framework makes most structural decisions for you. Dart Frog lives in the middle, and for […]
Your first scaling problem rarely arrives with a bang. For a while, everything is fine: pages load fast, the database barely breaks a sweat, and the team ships features without thinking much about infrastructure. Then traffic climbs. A campaign over-performs. A marketplace onboards a popular seller. A SaaS product signs a couple of enterprise accounts. […]
Technology is rapidly reshaping the world. Understanding how to use free learning resources and contribute to open source projects can be very helpful to start your career in this field. We just published a talk on the freeCodeCamp Spanish YouTube channel about how to leverage freeCodeCamp’s free learning resources and community to start your career […]
If you have ever wanted to collect product data, monitor competitors, track SEO rankings, or build AI tools that pull information from the internet, you have likely run into the common frustrations of web scraping: broken scripts, rate limits, bot detection, and tedious CAPTCHAs. We just published a new tutorial on the freeCodeCamp.org YouTube channel, […]
Every application that handles user data eventually hits the same problem: not all users should see the same things. A junior nurse should not be able to access every patient record in the hospital. A contractor should not be able to read internal financial reports. An employee logged in from an unrecognized device at 2AM […]
Modern payment systems look simple from the outside. A user clicks a button, enters payment details, and money moves from one account to another. But once payments happen repeatedly rather than once, the backend becomes much more complex. Subscriptions, memberships, SaaS billing, and donation platforms all depend on repeat transactions that happen automatically over time. […]
Working with healthcare data introduces preprocessing challenges that go beyond those you might encounter with structured data. Some familiar techniques still apply, while others look very different once your data becomes medical images. In this article, you’ll learn how to prepare a real-world medical imaging dataset for machine learning, from initial data validation to a […]