A precision Vanilla JavaScript countdown timer demonstrating continuous DOM updates and time-based state management. Features include Date object arithmetic, interval lifecycle handling (Start/Pause/Reset), and real-time millisecond conversion into days, hours, minutes, and seconds.
Provably correct day-count and accrued-interest calculations TypeScript library and MCP server.
A line-oriented natural-language calculation engine in TypeScript. Resolves lines like "200 usd in eur", "6 m / 2 s" and "today + 21 days". Lexer, Pratt parser, typed evaluator, zero runtime dependencies.
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