React Native Calculator with Dark Mode | Beginner Tutorial 2022

A calculator sounds basic until you try to make long numbers fit the screen and support dark mode. That's exactly why I picked it for this beginner project: it forces you to learn state, React Context, and dynamic styles the practical way. I walk through every step in the video, from expo init to the finished app.

What's inside

• Set up a fresh Expo project with TypeScript
• Share a light and dark theme app-wide with React Context, no prop drilling
• Build a reusable button component with style and event props
• Wire up add, subtract, multiply, and divide with clean state
• Shrink the display font so long numbers still fit
• Round out the UX with clear and backspace buttons

Resources

CourseReact Native course

Go deeper in the Style & Design section: 80 minutes on design systems, dark mode, and Flexbox.