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Writing a Toy Programming Language: Lexer, Parser, Interpreter

Step-by-step tutorial on writing an interpreted programming language from scratch in TypeScript: Lexer tokenizer, Recursive Descent Parser, and Evaluator.

Sachin Sharma
Sachin SharmaCreator
Aug 6, 2026
3 min read
Writing a Toy Programming Language: Lexer, Parser, Interpreter
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Step-by-step tutorial on writing an interpreted programming language from scratch in TypeScript: Lexer tokenizer, Recursive Descent Parser, and Evaluator.

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Sachin Sharma

Sachin Sharma

Software Developer & Mobile Engineer

Building digital experiences at the intersection of design and code. Sharing weekly insights on engineering, productivity, and the future of tech.

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