13.1 The Main Collections Traits13.2 Mutable and Immutable Collections13.3 Sequences13.4 Lists13.5 Sets13.6 Operators for Adding or Removing Elements13.7 Common Methods13.8 Mapping a Function13.9 Reducing, Folding, and Scanning13.10 Zipping13.11 Iterators13.12 Streams13.13 Lazy Views13.14 Interoperability with Java Collections13.15 Parallel CollectionsExercises