Sets, Maps, and Object.groupBy

Description:
Store deduplicated values, build arbitrary key-value maps, and group collections using modern JavaScript collections and static groupBy methods.

Chapters:
00:00 Intro
00:13 Fast Deduplication and Native Grouping
00:29 Collections and Key Storage Models
00:45 Map vs Plain Object
01:06 Set Operations and Deduplication
01:29 Map Operations and Size
01:53 Arbitrary Keys vs String Coercion
02:16 Iteration and Object Conversions
02:38 Grouping Records with Object.groupBy
03:03 Grouping with Non-String Keys via Map.groupBy
03:23 Mistake: Object Reference Identity
03:47 Mistake: Map Bracket Property Access
04:11 Mistake: Object.groupBy Null Prototype
04:34 Hash Tables and SameValueZero
04:57 Performance and Shape Stability
05:19 Four Core Principles and Tomorrow's Habit
05:45 Checkpoint: Set Reference Equality
06:14 Checkpoint: Object.groupBy Null Prototype
06:41 Next Lesson: Modern Non-Mutating Methods