CodeKeysTypeScript typing practice
Type TypeScript faster: annotations like : string, generics <T>, optional ?:, arrow functions and interfaces. Start typing below - no sign-up.
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What makes code typing different
General typing trainers drill prose, where letters dominate. In code, symbols and casing carry much of the load. CodeKeys measures every key, symbol cluster and keyword, finds the weakest one, and generates practice that looks like the language while drilling your weak spots.
Types at speed
Practise : string, <T>, ?:, as const and readonly - the syntax TypeScript adds on top of JavaScript.
Adapts to you
Every key and symbol is timed; your weakest one fills the next lesson until it reaches your target speed.
Real TypeScript
Drills and real snippets with interfaces, generics, classes, async code and modules.
Private and offline
No account, no cookies, nothing leaves your browser. Install it as an app and practise offline.