Hack University

Programming Language Practice

Learn Python, JavaScript, TypeScript, Java, and C++ by running code.

19 fast online compilers let you write, compile, and run code in an isolated sandbox with no setup and no sign-up. Use them beside a programming language course, a syntax cheatsheet, or DSA practice when you want feedback immediately.

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19 compilers

Learn to Code

Pair a compiler with the right learning path

Start with a language, keep the compiler open for experiments, then move into structured lessons, quick references, and interview-style practice as the syntax becomes familiar.

Python compilerJavaScript compilerTypeScript compilerJava compilerC++ compilerFree course outlinesSyntax cheatsheetsDSA practice

Every compiler runs your code in a fast, isolated sandbox. Logged-in Hack University members can keep work synced, use the shared whiteboard, and unlock AI debugging with Premium credits or their own OpenAI API key.