Mario | Full-Stack Dev @mXbase
Full-stack dev (TypeScript, Node, React). Building in public and sharing what I learn so you can skip a few of my mistakes. Remote Joined September 2022-
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Today I began developing an AI assistant that integrates with Canvas and serves as a personal academic operations manager for students. Rather than requiring students to navigate multiple courses, deadlines, and announcements, the assistant consolidates critical information into a single view, highlights priorities, tracks progress, and provides timely reminders. My objective is to create a tool that helps students stay proactive, organized, and accountable throughout the semester. Try it! x.ai/bot/A_yUaLzn9a… #EdTech #AI #Productivity #HigherEducation #BuildInPublic
The payoff: inside if (state.status === "success"), TypeScript knows data exists. No data?. everywhere, no "can this be undefined here?" guessing. Same idea works for forms, auth state, and anything with a lifecycle.
A TypeScript type that prevents a whole category of bugs. A lot of request state starts out like this: isLoading: boolean error?: string data?: User[] It looks fine. But those three fields can be combined 8 different ways, and only 4 of them make sense. Nothing stops isLoading being true while error is set, so your UI shows a spinner and an error message at the same time. Or data and error both exist, and now every component has to guess which one wins. The fix is a discriminated union: one "status" field that says which state you're in, with each state carrying only the data it needs. idle: nothing yet loading: nothing yet error: an error message success: the data (Code in the image.) Three things get better right away: 1. Impossible states can't be written. If you try to set data on the loading state, it won't compile. 2. Narrowing does the work for you. Inside if (state.status === "success"), TypeScript knows data exists. No more data?. scattered everywhere. 3. You can't forget a case. Switch on state.status and add a never check in the default branch. When someone adds a new state later, the compiler points to every place that doesn't handle it yet. Where else this pattern helps: form submission, auth state (signed out, signing in, signed in, expired), file uploads, and anything else with a lifecycle. Rule of thumb: if two or more fields have to change together to stay consistent, they probably belong in one union. If you're newer to TypeScript, this is one of the highest-value patterns to learn early. It turns bugs you'd only find at runtime into errors your editor shows you as you type.
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