Tier 2 · Intermediate

Expense Tracker

Track spending by category — private class fields, reduce aggregation, JSON persistence, CSV export.

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Pick your language

The same project, implemented from scratch in each language. Same logic, different syntax — the best way to truly understand a language.

🐍PythonAvailable now →🟨JavaScriptAvailable now →
JavaComing soon
🐇GoComing soon
🦀RustComing soon

Each version teaches the same core idea — pick the one that matches what you want to learn. New languages and variants are added continuously.

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