immutable-js/immutable-js 3.0.0

on GitHub

v3.0.0 brings the Immutable collection API closer to ES6 Map and Set, introduces opt-in lazy operations, clarifies the differences between keyed and non-keyed collections and more.

A lot has changed, please check out the upgrade guide for more details and help for upgrading your code to work with this new version of the library.

New:

• Collection methods (map, filter, etc) are now eager by default.
• Seq and toSeq for explicit lazy operations.
• Renamed Sequence to Iterable
• Renamed Vector to List
• Renamed length to size
• Constructors now always accept Iterable.
  • empty() and from() removed
  • of(...values) on indexed and set collections
• contrib/ directory
  • Cursor now moved to contrib.
• "is type" predicates exist on all major Iterable types, such as Map.isMap().
• groupBy() and countBy() return concrete Map.
• Added: keyOf() and lastKeyOf() on KeyedIterable are similar to indexOf() and lastIndexOf() on IndexedIterable.