A Math-Expression Parser in 250 Lines of JavaScript — Recursive Descent, Right-Associative ^, and -2^2 = -4

📰 Dev.to · SEN LLC

Learn to build a math-expression parser in JavaScript using recursive descent, handling right-associative operators and edge cases like -2^2 = -4

intermediate Published 20 May 2026
Action Steps
  1. Build a recursive descent parser to handle mathematical expressions
  2. Implement right-associative operators like ^
  3. Handle edge cases like -2^2 = -4 using operator precedence
  4. Test the parser with various mathematical expressions
  5. Optimize the parser for performance and readability
Who Needs to Know This

Developers and software engineers can benefit from this article to improve their skills in parsing mathematical expressions and handling edge cases in their applications

Key Insight

💡 Recursive descent parsing can effectively handle mathematical expressions with right-associative operators and edge cases

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📝 Build a math-expression parser in 250 lines of JavaScript! 🤯

Key Takeaways

Learn to build a math-expression parser in JavaScript using recursive descent, handling right-associative operators and edge cases like -2^2 = -4

Full Article

Every "math evaluator in N lines" article either uses shunting-yard (Dijkstra's stack-based RPN...
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