Structural Design Principles

These principles originated in object-oriented design but apply to any programming paradigm . They're about code structure, not paradigm.

Paradigm Translations

In functional programming (Elixir), they manifest as:

• Composition Over Inheritance → Function composition, module composition, pipe operators
• Law of Demeter → Minimize coupling between data structures, delegate to owning modules
• Tell, Don't Ask → Push logic to the module owning the data type
• Encapsulation → Module boundaries, immutability, pattern matching, opaque types