Ruby 2.5 What's New

Transcript

1. Urabe, Shyouhei Ruby 2.5
 What’s New

2. ·ͣ͸֓ܗ͔Β

3. EJ⒎
   TUBUT 
   ˠ
    1585 files changed, 147854 insertions(+), 72571 deletions(-) 
   ˠ
   

   1549 files changed, 120363 insertions(+), 70385 deletions(-) 
   ˠ
    2933 files changed, 103658 insertions(+), 62082 deletions(-) 
   ˠ
    2263 files changed, 82556 insertions(+), 289978 deletions(-) 
   ˠ
   USVOL 7061 files changed, 360060 insertions(+), 34025 deletions(-)
4. None
5. None

6. bundler w ͍·ͷͱ͜Ζ͓ͦΒ͘࠷ޙͷඪ४ఴ෇ϥΠϒϥϦ
   w ͔Β͸ɺઃఆෆཁͰ͍͖ͳΓ
   Gemfile
   Λ
   ͋Ε ͹ ಡΉΑ͏ʹͳΔ

7. ଞϥΠϒϥϦ • Rubyspec • RDoc 6 (ripper integration) • ERb#result_with_hash

   • SecureRandom.alphanumeric • Binding#irb • etc.

8. ERb#result_with_hash erb = ERb.new("<%= foo %>") erb.result_with_hash(foo: "1") # =>

   "1"

9. SecureRandom.alphanumeric SecureRandom.alphanumeric(32) # => "Xr3GCd3y2wkUgEF9lSh5pD2s5NDpeHSM"

10. Binding#irb def foo while true do raise unless rand <

    0.5 end rescue binding.irb # <= end

11. ίΞΫϥε • String#delete_prefix / String#delete_suffix • Array#append / Array#prepend •

    Dir#children / Dir#each_child • Hash#transform_keys • Kernel#yield_self

12. String#delete_prefix "log.fluentd.message {...".delete_prefix("log.") # => "fluentd.message {..."

13. Array#append %w'dolor sit amet'.prepend(%w'lorem ipsum') # => [["lorem", "ipsum"], "dolor",

    "sit", "amet"] %w'dolor sit amet'.prepend('lorem', 'ipsum') # => ["lorem", "ipsum", "dolor", "sit", "amet"]

14. Hash#transform_keys {foo: 'bar'}.transform_keys(&:to_s) # => {"foo"=>"bar"}

15. Kernel#yield_self {foo: 'bar'}.yield_self {|i| JSON.dump(i) } # => "{\"foo\":\"bar\"}"

16. จ๏ͱ͔ • do … rescue … end • Toplevel constant

    lookup removal • Reverse backtrace order

17. do … rescue … end 128.times do |i| raise unless

    rand < 0.5 rescue RuntimeError puts $! end

18. Reverse backtrace zsh % ruby -e 'def foo; bar; end'

    -e 'def bar; raise; end' -e 'foo' Traceback (most recent call last): 2: from -e:3:in `<main>' 1: from -e:1:in `foo' -e:2:in `bar': unhandled exception [1] 34131 exit 1 ruby -e ‘…’ zsh % ruby -e 'def foo; bar; end' -e 'def bar; raise; end' -e 'foo' 2>&1 | cat -e:2:in `bar': unhandled exception from -e:1:in `foo' from -e:3:in `<main>' [1] 34291 exit 1 ruby -e ‘…’ 2>&1 | 34292 done cat