Data structures

Data structures decide how information is stored and how efficiently it can be accessed. The right choice depends on the operations you need most often.

Start exploring

• Hash tables — Insert values into buckets and visualize collisions.
• Stacks and queues — Compare LIFO and FIFO behavior.

Structure	Typical strength	Key idea
Array	Fast indexed access	Contiguous or array-like storage
Stack	Undo/history	Last in, first out
Queue	Scheduling/tasks	First in, first out
Hash table	Fast average lookup	Hash keys into buckets

Note

Performance varies by implementation and workload. Hash table operations have average-case and worst-case differences.