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Guides for the playground
Original articles that explain how Code Arena works — and how to get more out of JavaScript, TypeScript, and Python online.
How the JavaScript AST view works in Code Arena
A practical guide to abstract syntax trees: what they are, how Code Arena builds one from your JavaScript, and how pan, zoom, and node selection help you learn syntax.
Updated July 19, 2026Running TypeScript online with Node type stripping
How Code Arena executes TypeScript with Node.js type stripping — what works, what does not, how it differs from tsc, and how to design playground-friendly typed snippets.
Updated July 19, 2026What a sandboxed online compiler actually does
A clear look at how browser editors talk to isolated runtimes — why sandboxes matter for safety, what limits you will hit, and how Code Arena’s model fits teaching and everyday experiments.
Updated July 19, 2026JavaScript console basics in the browser playground
How to print values, structure debug output, and read the Output panel in Code Arena’s JavaScript editor — with habits that transfer to Node and browsers.
Updated July 19, 2026Reading JavaScript errors without guessing
A practical field guide to SyntaxError, ReferenceError, TypeError, and stack traces in Code Arena — so you fix the first real problem instead of rewriting everything.
Updated July 19, 2026Sharing code snippets safely (what URLs expose)
How Code Arena share links work, what they encode, how URLs leak through chat and history, and a practical checklist before you hit Share.
Updated July 19, 2026Python online: common beginner errors and fixes
Fix IndentationError, NameError, TypeError, SyntaxError, and loop timeouts quickly in Code Arena’s Python editor — with a traceback-reading habit that scales.
Updated July 19, 2026Online compiler vs local setup: when to use which
A practical comparison of playgrounds like Code Arena and a local Node/Python install — so you pick the right environment for learning, debugging, and real projects.
Updated July 19, 2026Timeouts and rate limits in an online playground
Why Code Arena limits run time and request frequency, how those limits show up when you code, and how to rewrite snippets so they finish cleanly.
Updated July 19, 2026Debugging with small experiments
A method for isolating bugs in online compilers: shrink the program, form a hypothesis, change one variable, and keep a trail of what you learned.
Updated July 19, 2026