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55+ curated questions with the same answer shape every time: quick recap, deep dive, pitfalls, and follow-ups. Coverage includes patterns overview, singleton pattern, factory pattern, builder pattern, and more.
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.
Design patterns (fresher level) introduces the GoF patterns a junior should know. This module is an elevation arc: it opens with the patterns overview (what patterns are, why they exist), then the creational patterns (singleton, factory, builder), then structural (decorator) and behavioral (observer, strategy). It closes with when-to-use-patterns — the judgment tier that stops a fresher from pattern-spamming.
Full catalog
Topics are ordered for learning. Within each topic, rows are numbered 1–55 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 1–55 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 → Q55.