Stop Using Booleans Everywhere — Use Union Types Instead

📰 Dev.to · Maryan Mats

Learn to replace booleans with union types to eliminate entire categories of bugs and improve code reliability

intermediate Published 6 Apr 2026
Action Steps
  1. Identify areas in your code where multiple booleans are used to represent different states
  2. Replace booleans with union types to explicitly define all possible states
  3. Use type checking tools to ensure correctness and catch potential errors
  4. Refactor existing code to use union types and eliminate boolean blindness
  5. Test your code thoroughly to ensure the new implementation is correct and reliable
Who Needs to Know This

Software engineers and developers can benefit from this approach to write more robust and maintainable code, and it's especially useful for teams working on complex systems

Key Insight

💡 Using union types can help eliminate entire categories of bugs caused by boolean blindness

Share This
💡 Ditch booleans and use union types to eliminate bugs and improve code reliability!

Key Takeaways

Learn to replace booleans with union types to eliminate entire categories of bugs and improve code reliability

Full Article

Three booleans create 8 possible states — most of them impossible. Here's how Boolean Blindness causes real bugs in every language, and why union types eliminate entire categories of bugs.
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