1.5.0

Optimize Access.get/2

Optimize Base encode/decode

Implement Inspect for DateTime with Calendar.ISO

Add "ISO days" format for conversions between Calendars and Date.convert/2, Time.convert/2, NaiveDateTime.convert/2 and DateTime.convert/2 (as well as bang variants)

Add :calendar field to Time struct

Add Time.diff/3, Date.add/2, Date.diff/2, DateTime.diff/3

Add Date.range/2

Add Date.new/4, DateTime.utc_now/1, NaiveDateTime.new/8 and Time.new/5 that allow specifing calendar

Add Enum.chunk_by/4 and Stream.chunk_by/4

Add Enum.chunk_every/2 and Enum.chunk_every/4 with a more explicit API than Enum.chunk/2 and Enum.chunk/4

Add Exception.blame/3 that adds metadata to exceptions

Add File.read_link/1 and File.read_link!/1

Introduce :trim_bom option for File.stream!/2

Add :printable_limit to control the limit of printable structures

Add Integer.gcd/2

Add left not in right to check that the left side is not in the enumerable on the right

Use the new debug_info chunk in OTP 20. This provides a mechanism for tools to retrieve the Elixir AST from beam files

defoverridable/1 accepts a module name as argument and marks all callbacks as overridable

Allow non-quoted Unicode atoms and variables according to Unicode Annex #31 (see Unicode Syntax document)

Warn when a :__struct__ key is used when building/updating structs

Cache the AST on definitions. This speeds up the compilation time from 10% to 15% measured across different projects

Improve compiler error message on invalid patterns and guards

Add replace/3 and replace!/3 for replacing an existing key

List.starts_with?/2

Introduce Macro.generate_arguments/2

Optimize Map.merge/3 by choosing merging direction

Add replace/3 and replace!/3 for replacing an existing key

Raise BadMapError in Map.equal?/2 when either of the two arguments is not a map

Reduce MapSet size when serialized to approximately half

Add Process.cancel_timer/2

Show available implementations on Protocol.UndefinedError if the protocol has been consolidated

Support ETS guard conditions in Registry.match/3

Support parallel: true in Registry.dispatch/3

Introduce Registry.unregister_match/4

Add Stream.chunk_every/2 and Stream.chunk_every/4 with a more explicit API than Stream.chunk/2 and Stream.chunk/4

Optimise binary pattern matching in String.split/1 and String.trim_*/1

Add Supervisor.init/2 and Supervisor.child_spec/2

Allow module and {module, arg} to be given to Supervisor.start_link/2 and invoke module.child_spec(arg) on each argument

Support :on_timeout in Task.async_stream to control how tasks are terminated

Add ordered: false support to Task.async_stream

Show code snippet from test source file in case of test errors

Use Exception.blame/3 when formatting test errors

Make assert_raise/2 fail if the underlying exception has a broken message/1 implementation

Add start_supervised/2 and stop_supervised/1 to ExUnit. Processes started by this function are automatically shut down when the test exits

Support autocompletion of variable names

Support autocompletion of functions imported using import Mod, only: [...]

Use Exception.blame/3 when showing errors in the terminal

Add exports/1 IEx helper to list all exports in a module

Add break!/2, break!/4, breaks/0, continue/0, open/0, remove_breaks/0, remove_breaks/1, reset_break/1, reset_break/3 and whereami/1 for code debugging

No longer emit warnings for IEx commands without parentheses

Add runtime_info/0 for printing runtime system information

Add open/1 to open the source of a given module/function in your editor

Implement IEx.Info protocol for calendar types

Add metadata: :all configuration to log all metadata

Add --all-warnings option to Elixir compiler that shows all warnings from the previous compilation (instead of just of the files being compiled)

Strip debug information from escripts by default and add option :strip_beam which defaults to true

Ensure --no-deps-check do not trigger SCM callbacks (such as git)

Add --if-missing flag to local.hex mix task

Add Mix.Tasks.Profile.Cprof for count-based profiling

New styling for generated applications

not left in right is soft-deprecated in favor of left not in right

Deprecate Enum.filter_map/3 in favor of Enum.filter/2 + Enum.map/2 or for-comprehensions

Deprecate GenEvent and provide alternatives in its docs

Using () to mean nil is deprecated

:as_char_lists value in Inspect.Opts.t/0 type, in favor of :as_charlists

:char_lists key in Inspect.Opts.t/0 type, in favor of :charlists

Using Erlang parse transforms via @compile {:parse_transform, _} is deprecated

Deprecate Stream.filter_map/3 in favor of Stream.filter/2 + Stream.map/2

String.ljust/3 and String.rjust/3 are deprecated in favor of String.pad_leading/3 and String.pad_trailing/3 with a binary padding

String.strip/1 and String.strip/2 are deprecated in favor of String.trim/1 and String.trim/2

String.lstrip/1 and String.rstrip/1 are deprecated in favor of String.trim_leading/1 and String.trim_trailing/1

String.lstrip/2 and String.rstrip/2 are deprecated in favor of String.trim_leading/2 and String.trim_trailing/2 with a binary as second argument

char_list/0 type is deprecated in favor of charlist/0

Deprecate <%= in "middle" and "end" expressions, e.g.: <%= else %> and <%= end %>