3.7.1

New:

• contains() is now called includes() to match the ES6 specification. contains() still exists as an alias.

3.7.0

New:

• merge() family of functions now get the currently merging key as a 3rd argument, in case merge strategy should alter based on key.
• IndexedCursor now has push(), pop(), unshift() and shift() to more closely mirror List.
• Records initialize lazily. Creating a new Record type with Record({foo:"bar"}) involves a small bit of work. For applications with a large amount of Records, lazy initialization should help startup times.
• Maps can now be constructed by a List of Lists instead of only a List of Arrays.
• toString() prints Map string keys in quotes.

Fixes:

• is() allows usage of valueOf to return primitives without recursing or encountering a reference error.
• merge()/union() work inside withMutations when initial collection is empty. #405
• Producing subcursors using cursor.cursor() now returns a proper typed cursor. #381
• When a Record is passed to the same Record creation function, it's now returned directly.
• Ensure Records toString() correctly. #383
• Iterating over a sliced Seq can no longer cause an infinite recursion. #394
• Ensure we don't throw when hashing non-extensible object in a modern environment.
• Fix issue where non-existent function could be called if a collection doesn't have a size.

3.6.4

Fixes:

• 3.6.3 was a broken npm release.

3.6.3

Fixes:

• Improve test coverage of Stack, fixing #332 and #353
• Numerous typo fixings. Me spel gud.
• Fix collection toString() when an ES6 Symbol is a value in the collection.
• Consider a prototype-free object a "plain object". Fixes #302
• No long enumerates extra key in canDefineProperty in rare cases in some versions of Chrome

3.6.2

Fixes:

• Improves performance of creating Cursors.

3.6.1

Fixes:

• Iterating over a Cursor to a List could result in an infinite loop.

3.6.0

New:

• findEntry() and findLastEntry() will return [key, value] tuples of the first value to pass a predicate. Related to find() and findLast() which only return value.
• contrib/Cursor now has the wider suite of methods found on List and Map including:
  • updateIn()
  • setIn()
  • deleteIn()
  • merge()
  • mergeWith()
  • mergeIn()
  • mergeDeep()
  • mergeDeepWith()
  • mergeDeepIn()

Fixes:

• UMD module wrapper safer to use with CommonJS -> AMD bundlers.
• Clarified some examples in documentation

3.5.0

New:

• zip(), zipWith() and interleave() for combining multiple collections are new methods on indexed collections.
• isEmpty() is safer than comparing count() or size to 0.
• groupBy() now returns OrderedMap when called on an ordered collection.
• hashCode() included in public API

Fixes:

• Custom toJSON() methods on values in a collection respected when provided to JSON.stringify().
• Fixed issue with browserify including Cursor.
• Throws TypeError if getIn/updateIn/hasIn/etc. are not provided valid key paths.

3.4.1

Fixes:

• deleteIn alias now exists for all types (was missing from Map).
• Improve min/max to be order-independent when handling null/undefined/NaN

3.4.0

New:

• Improved documentation in Immutable.d.ts, resulting in better generated documentation.
• remove and removeIn are now alises for the methods delete and deleteIn. No effect on execution (but deleteIn is new).
• Added deleteIn on Record.
• Added hasIn - deeply query for value existence.
• Cursor onChange function can now intercept the new value and return an override (3598f8c).
• +0 and -0 are treated as the same value in Immutable.is (key equality and Set existence).
• valueOf() is now used when determining value equality between two objects. This allows Date to be used as Map key, and provides a more straight-forward way to implement value equality for custom types.

Fixes:

• Mapping over infinite Seq no longer throws error about Infinite iteration. (Improve accuracy of infinite iteration warning overall).
• Ensure setIn can set undefined as a value.
• List iterators no longer return invalid values if the List was the result of a slice or shift.