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Changelog for Elixir v1.2

v1.2 brings enhancements, bug fixes, performance improvements and more into Elixir. Elixir v1.2 supports only Erlang 18. Upgrading to Erlang 18 is therefore recommended before upgrading Elixir.

v1.2.0-dev

1. Enhancements

Elixir

  • [Base] Optimize encode and decode operations about 10 times
  • [Enum] Use the faster and auto-seeding :rand instead of :random in Enum.shuffle/1 and Enum.random/1 and Enum.take_random/2
  • [GenServer] Add GenServer.stop/1 for reliably shutting servers down
  • [Kernel] Support multiple aliases in alias, import, require and use. For example, alias MyApp.{Foo, Bar, Baz}
  • [Kernel] Add struct!/2. Similar to struct/2 but raises on invalid keys
  • [Kernel] Warn if @doc/@typedoc/@moduledoc attributes are redefined
  • [Kernel] Mark quoted expressions as generated avoiding false positives on dialyzer
  • [Kernel] Allow variables as map keys on creation %{key => value} and on matches %{^key => value}
  • [Kernel] Allow the pin operator ^ in fn clauses and on the left side of <- in for comprehensions
  • [Kernel] Introduce with as a special form that allows matching on right side parameters
  • [Kernel] Raise when right hand side of -> does not provide any expression
  • [Kernel] Warn if the Elixir was compiled with a different endianness than the one currently available at runtime
  • [Kernel] Warn if a variable is used after being defined exclusively in a nested context
  • [Kernel] Warn if piping into an expression without parenthesis
  • [Macro] Add Macro.traverse/4 that performs pre and post-walk at once
  • [Macro] Add Macro.camelize/1 and Macro.underscore/1
  • [Process] Add Process.get_keys/0
  • [String] Introduce String.trim_{prefix,suffix,leading,trailing}/2. The first two will remove only the first occurrence of the given match in string. The last two will remove all occurrences of the given match
  • [String] Support String.normalize/2 and String.equivalent?/2 that perform NFD and NFC normalization
  • [Task] Add Task.Supervisor.async_nolink/1/3 that spawns a supervised task without linking to the caller process
  • [Task] Introduce Task.yield_many/2
  • [Task] Raise an error when a task is queried from a non-owning process (instead of waiting forever)

IEx

  • [IEx] Display type docs for t(Module.type) and t(Module.type/arity)
  • [IEx] Add i/1 helper that prints information about any data type

Logger

  • [Logger] Add file to logger metadata

Mix

  • [Mix] Cache and always consolidate protocols
  • [Mix] Add warn_test_pattern to mix test that will warn on potentially misconfigured test files
  • [Mix] Introduce MIX_QUIET environment variable that configures the underlying Mix task to output only error messages
  • [Mix] Validate git options and warn on conflicting ref, branch or tags

2. Bug fixes

Kernel

  • [Kernel] Change __ENV__.file if @file is set for the given function
  • [Kernel] Make Kernel.ParallelRequire aware of :warning_as_errors
  • [Kernel] Improve error message for invalid do/do:

IEx

  • [IEx] Do not start apps on recompile helper if --no-start was given
  • [IEx] Avoid copying of data when evaluating every expression in IEx

Mix

  • [Mix] Always run non-recursive tasks at the umbrella root
  • [Mix] Ensure rebar projects work on directory names that contain non-latin characters
  • [Mix] Ignore directories inside apps in umbrellas that do not have a mix.exs file

3. Soft deprecations (no warnings emitted)

Kernel

  • [Dict] Dict and HashDict are soft deprecated in favor of Map
  • [Keyword] Keyword.size/1 is deprecated in favor of length/1
  • [Map] Map.size/1 is deprecated in favor of map_size/1
  • [Set] Set and HashSet are soft deprecated in favor of MapSet

Mix

  • [Mix] Mix.Utils.camelize/1 and Mix.Utils.underscore/1 are soft deprecated in favor of Macro.camelize/1 and Macro.underscore/1

4. Deprecations