My/Principle/Simplify/Create Uniform Interfaces
- design systems with clean Interfaces that are well-documented and well-tested
- don't proliferate interfaces; use creativity to simplify the number and shape of interfaces
REST API Design
- all endpoints return the same error shape, the same pagination envelope, the same field naming convention
- callers can apply knowledge from one endpoint to every other endpoint without consulting docs
CLI Design
- all CLI commands accept
--dry-run and --verbose with the same semantics - flag names for similar concepts (e.g.
--output, --format) are spelled identically across commands
- a collection type exposes the same iteration, filtering, and mapping interface as built-in types
Why
- consistent interfaces reduce the total interface surface a user must learn
- when users can predict behavior from pattern-matching, they make fewer errors and need less documentation
- see also My/Principle/Simplify/Minimize Surface Area — uniformity is one way to keep surface area manageable
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