Building a JavaScript interpreter, part 1 — Parsing with Pratt

📰 Medium · Programming

Learn to build a JavaScript interpreter using the Pratt parsing algorithm and improve your understanding of programming language internals

advanced Published 22 Jun 2026
Action Steps
  1. Implement the Pratt parsing algorithm in JavaScript to parse expressions
  2. Build a lexer to tokenize the input code
  3. Create an abstract syntax tree (AST) to represent the parsed code
  4. Write a parser to construct the AST from the tokenized input
  5. Test the parser with sample JavaScript code to ensure correctness
Who Needs to Know This

Software engineers and developers interested in compiler design and programming language theory can benefit from this article to deepen their knowledge of interpreter construction

Key Insight

💡 The Pratt parsing algorithm is a top-down parsing technique that can be used to parse expressions in JavaScript

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🚀 Build your own JavaScript interpreter using Pratt parsing! 💻

Key Takeaways

Learn to build a JavaScript interpreter using the Pratt parsing algorithm and improve your understanding of programming language internals

Full Article

Which JavaScript developer in it’s career didn’t had a moment where they where like, you know what, I would really like to build an… Continue reading on Medium »
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