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3+ curated questions with the same answer shape every time: quick recap, deep dive, pitfalls, and follow-ups. Coverage includes include vs extend, enumerable comparable, namespacing.
Suggested path
Topics follow a teaching order. Each answer ends with a clear Next question control so you can move forward without hunting the list.
Ruby modules interview questions cover two key uses: namespacing and mixins. This module covers the module as namespace (module Animals; class Dog; end; end → Animals::Dog), include for adding instance methods to a class, extend for adding module methods as class-level methods, the basic include vs extend difference, Enumerable — what you get for implementing each (map, select, sort, min, max, group_by, and more), Comparable — what you get for implementing <=> (all comparison operators and between? and clamp), why Ruby uses modules for mixins instead of multiple inheritance, and the ancestors chain as the simple mental model for method lookup. Examples stay at beginner level — no prepend, no MRO tracing.
Full catalog
Topics are ordered for learning. Within each topic, rows are numbered 1–3 globally so you always know where you are. Collapse topics if you want a lighter view — use Expand all when you need the full list again.
Numbers 1–3 follow the order we recommend — click any row to open the full answer, or use the sticky Next link at the bottom of each page to go Q1 → Q3.