Hashing
Episode 13 Maps
▶ This video is coming to YouTube soon.
You'll be able to use HashMap's put, get, getOrDefault, containsKey, merge and computeIfAbsent, know how a map hashes only its keys, loop over entries safely, build a small map, solve counting, grouping and two sum, and picks between HashMap, LinkedHashMap and TreeMap.
Quiz: test yourself
The 3 questions from the end of the episode. Pick an answer to see why it's right.