Data Structures Hiding in Your Codebase: A Field Guide for Frontend Engineers

Algorithms feel abstract until you spot them in the code you already ship. This quiz is for frontend engineers who want to understand algorithms by recognising the data structures already running their UI: the DOM as a tree, a bundler's imports as a directed graph solved by topological sort, the command palette as a trie, undo/redo as stacks and the task queue as a queue, React's scheduler as a min-heap, and SWR/React Query as LRU caches. Six topics, sixty questions, every answer anchored in real browser and framework behaviour.