What's New in Ruby 2.5?
Sam Backus
@SamBackus
sbackus@patientslikeme.com
Happy Holidays!
Follow along
$ rbenv install 2.5.0
or
$ rvm install 2.5.0
Speed Improvements!
Speed Improvements!
-
About 5-10% performance improvement by removing all trace instructions from overall bytecode
-
Block passing by a block parameter (e.g. def foo(&b); bar(&b); end) is about 3 times faster than Ruby 2.4 by “Lazy Proc allocation”
-
Mutex is rewritten to be smaller and faster
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ERB now generates code from a template twice as fast
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Improve performance of some built-in methods
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IO.copy_stream uses copy_file_range(2) to copy offload
Oldest call first, most recent call last.
Print backtrace and error message in reverse order
Note: the order is reversed only when the backtrace is printed out to the terminal directly.
rescue/else/ensure are now allowed to be used directly with do/end blocks
Array#prepend/append
as aliases of unshift/push
Kernel#yield_self
Enumerable#any?, all?, none?, and one? accept a pattern argument.
String#delete_prefix
String#delete_suffix
Hash#slice and Hash#transform_keys
Follow along
$ rbenv install 2.6.0-rc2
Speed improvements!
- Proc#call is 1.4x faster
- block.call is 2.4x faster when passed a block
- Transient Heap is introduced, making small and short lived hash objects 2x faster.
Speed improvements!
New JIT compiler
slower startup time
faster runtime
New JIT compiler
How to use: Just specify --jit in command line or $RUBYOPT environment variable
yield_self aliased to then
Endless ranges (1..)
Array#union
Array#difference
Array#filter is a new alias for Array#select
Merge Bundler as Default gem
You no longer need to gem install bundler
References:
- Ruby 2.5.0 announcement
- Ruby 2.6.0-rc2 announcment
- RubyConf 2018 - The secret power of Ruby 2.6: JIT by Takashi Kokubun
- What's New in Ruby 2.6 by Guy Maliar
- Ruby's new JIT compiler by Shannon Skipper
- Yield_self in Ruby 2.5 by Michal Lomnicki
-
Ruby 3x3: Matz, Koichi, and Tenderlove on the future of Ruby Performance