New features in Ruby 2.5
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Ruby 2.5 includes new features such as allowing rescue/else/ensure blocks directly in do/end, yield_self, Hash slicing methods, and Struct classes that accept keyword arguments. It also provides performance improvements like removing trace instructions for 5-10% faster execution and optimizing block passing. Additionally, there are other notable changes like Thread exceptions defaulting to report, SecureRandom preferring OS sources, and updates to standard libraries, Unicode version, RubyGems, and RDoc.
![Enumerable#any?, all?, none?, and one? accept a pattern argument
[1, 3.14, 2ri].all?(Numeric) # => true
if should_be_all_symbols.any?(String)
...
end
some_strings.none?(/aeiou/i)](https://image.slidesharecdn.com/180109haxorpresentation-ruby2-180111150600/85/New-features-in-Ruby-2-5-12-320.jpg)
![Array#prepend/append as aliases of unshift/push
array = [3, 4]
array.prepend(1, 2) #=> [1, 2, 3, 4]
array #=> [1, 2, 3, 4]
array = [1, 2]
array.append(3, 4) #=> [1, 2, 3, 4]
array #=> [1, 2, 3, 4]](https://image.slidesharecdn.com/180109haxorpresentation-ruby2-180111150600/85/New-features-in-Ruby-2-5-13-320.jpg)
New features in Ruby 2.5
- 1. RUBY 2.5 IRENEUSZ SKROBIŚ Lead developer @ SELLEO
- 2. AGENDA
- 7. rescue/else/ensure are now allowed to be used directly with do/end blocks AFTER: lambda do raise 'err' rescue $! # => #<RuntimeError: err> end.call BEFORE: lambda do begin raise 'err' rescue $! # => #<RuntimeError: err> end end.call
- 8. Add yield_self to yield given block in its context class Object def yield_self(*args) yield(self, *args) end end 2.yield_self { |x| x*x } # => 4
- 9. Hash#slice & Hash#except { a: 1, b: 2, c: 3, d: 4 }.slice(:a, :b) # => { a: 1, b: 2 } { a: 1, b: 2, c: 3, d: 4 }.except(:a, :b) # => { c: 3, d: 4 }
- 10. Hash#transform_keys { a: 1, b: 2 }.transform_keys { |k| k.to_s } => { "a"=>1, "b"=>2 }
- 11. Struct.new can create classes that accept keyword arguments Point = Struct.new(:x, :y, :color) point1 = Point.create(x: 1, y: 2) # => Point<x: 1, y: 2, color: nil> point2 = Point.create!(x: 1, y: 2) # => ArgumentError, color not specified.
- 12. Enumerable#any?, all?, none?, and one? accept a pattern argument [1, 3.14, 2ri].all?(Numeric) # => true if should_be_all_symbols.any?(String) ... end some_strings.none?(/aeiou/i)
- 13. Array#prepend/append as aliases of unshift/push array = [3, 4] array.prepend(1, 2) #=> [1, 2, 3, 4] array #=> [1, 2, 3, 4] array = [1, 2] array.append(3, 4) #=> [1, 2, 3, 4] array #=> [1, 2, 3, 4]
- 14. Top-level constant look-up is no longer available # this is removed: irb(main):001:0> class Auth; end => nil irb(main):002:0> class Twitter; end => nil irb(main):003:0> Twitter::Auth (irb):3: warning: toplevel constant Auth referenced by Twitter::Auth => Auth
- 15. Print backtrace and error message in reverse order AFTER: stack frame 3 stack frame 2 stack frame 1 Main Error Message ..... BEFORE: Main Error Message stack frame 1 stack frame 2 stack frame 3 .....
- 17. Performance improvements ◉ About 5-10% performance improvement by removing all trace instructions from overall bytecode (instruction sequences)
- 18. Performance improvements ◉ About 5-10% performance improvement by removing all trace instructions from overall bytecode (instruction sequences) ◉ Block passing by a block parameter (e.g. def foo(&b); bar(&b); end) is about 3 times faster than Ruby 2.4
- 19. Performance improvements ◉ About 5-10% performance improvement by removing all trace instructions from overall bytecode (instruction sequences) ◉ Block passing by a block parameter (e.g. def foo(&b); bar(&b); end) is about 3 times faster than Ruby 2.4 ◉ ERB now generates code from a template twice as fast as Ruby 2.4
- 20. Performance improvements ◉ About 5-10% performance improvement by removing all trace instructions from overall bytecode (instruction sequences) ◉ Block passing by a block parameter (e.g. def foo(&b); bar(&b); end) is about 3 times faster than Ruby 2.4 ◉ ERB now generates code from a template twice as fast as Ruby 2.4 ◉ (and more…)
- 22. Other notable changes ◉ Thread.report_on_exception is now set to true by default.
- 23. Other notable changes ◉ Thread.report_on_exception is now set to true by default. ◉ SecureRandom now prefers OS-provided sources over OpenSSL
- 24. Other notable changes ◉ Thread.report_on_exception is now set to true by default. ◉ SecureRandom now prefers OS-provided sources over OpenSSL ◉ Promote cmath, csv, date, dbm, etc, fcntl, fiddle, fileutils, gdbm, ipaddr, scanf, sdbm, stringio, strscan, webrick, zlib from standard libraries to default gems.
- 25. Other notable changes ◉ Thread.report_on_exception is now set to true by default. ◉ SecureRandom now prefers OS-provided sources over OpenSSL ◉ Promote cmath, csv, date, dbm, etc, fcntl, fiddle, fileutils, gdbm, ipaddr, scanf, sdbm, stringio, strscan, webrick, zlib from standard libraries to default gems. ◉ Update supported Unicode version to 10.0.0.
- 26. Other notable changes ◉ Thread.report_on_exception is now set to true by default. ◉ SecureRandom now prefers OS-provided sources over OpenSSL ◉ Promote cmath, csv, date, dbm, etc, fcntl, fiddle, fileutils, gdbm, ipaddr, scanf, sdbm, stringio, strscan, webrick, zlib from standard libraries to default gems. ◉ Update supported Unicode version to 10.0.0. ◉ Update to RubyGems 2.7.3, RDoc 6.0.1.
- 27. Other notable changes ◉ Thread.report_on_exception is now set to true by default. ◉ SecureRandom now prefers OS-provided sources over OpenSSL ◉ Promote cmath, csv, date, dbm, etc, fcntl, fiddle, fileutils, gdbm, ipaddr, scanf, sdbm, stringio, strscan, webrick, zlib from standard libraries to default gems. ◉ Update supported Unicode version to 10.0.0. ◉ Update to RubyGems 2.7.3, RDoc 6.0.1. ◉ (and more…)
- 29. THANKS! Live long and prosper :) Ireneusz Skrobiś @ireneuszskrobis