5 Random Ruby Tips

June 2nd @ RubySG Meetup

Transcript

1. 3VCZ5JQT 5
2. ,WCPKVQ(CVCU !
3. @JuanitoFatas
4. @JuanitoFatas
5. @JuanitoFatas
6. @JuanitoFatas
7. 0GY9CTPKPI UKPEG4WD[ 1
8. $JSDVMBS
   "SHVNFOU
   3FGFSFODF
   &SSPS def foo(foo=foo) foo end < 2.2.2 => No problems at all >= 2.2.2 => warning: circular argument reference - foo
9. $JSDVMBS
   "SHVNFOU
   3FGFSFODF
   &SSPS def foo(foo=foo()) foo end https://bugs.ruby-lang.org/issues/10314 Fixed
10. 0GY9CTPKPI UKPEG4WD[ 2 4GI'ZR
11. -JUFSBM /http:\/\/ruby.sg/ %r{http://ruby.sg}
12. Character Properties http://ruby-doc.org/core-2.2.2/Regexp.html#class-Regexp-label-Character+Properties
13. \p{} $POTUSVDU
14. \p{Letter} -FUUFS a, b, c
15. \p{Mark} .BSL bon appétit qué pasa Köln
16. \p{Number} /VNCFS 1, 2, 3
17. \p{Punctuation} 1VODUVBUJPO , ; .
18. \p{Word} 8PSE Letter, Mark, Number, Connector_Punctuation
19. \p{Symbol} 4ZNCPM + = |
20. \p{Han} .BUDI
    $IJOFTF if your application goes to China
21. \p{Hiragana,Katakana} .BUDI
    +BQBOFTF
22. \p{Hangul} .BUDI
    ,PSFBO
23. 3 'PWOGTCDNG
24. users.sort { |a, b| a.balance <=> b.balance } users.sort_by(&:balance) TPSU
    WT
    TPSU@CZ
25. > Benchmark.ips do |x| x.report(" sort") { users.sort { |a, b| a.balance <=> b.balance } } x.report("sort_by") { users.sort_by(&:balance) } x.compare! end
26. Calculating ------------------------------------- sort 1.158k i/100ms sort_by 2.401k i/100ms ------------------------------------------------- sort 12.140k (± 4.9%) i/s - 61.374k sort_by 24.169k (± 4.0%) i/s - 122.451k Comparison: sort_by: 24168.9 i/s sort: 12139.8 i/s - 1.99x slower
27. users.sort_by(&:balance).take 3 NJO@CZ
    WT
    TPSU@CZ users.min_by 3, &:balance R uby 2.2
28. > Benchmark.ips do |x| x.report("sort_by") { users.sort_by(&:balance).take 3 } x.report(" min_by") { users.min_by 3, &:balance } x.compare! end
29. Calculating ------------------------------------- sort_by 12.000 i/100ms min_by 44.000 i/100ms ------------------------------------------------- sort_by 126.314 (± 4.0%) i/s - 636.000 min_by 462.227 (± 5.2%) i/s - 2.332k Comparison: min_by: 462.2 i/s sort_by: 126.3 i/s - 3.66x slower
30. 4 5VTKPI
31. $PODBUFOBUJPO "foo" + "bar" "foo".concat "bar" "foo" << "bar" "foo" "bar" JuanitoFatas/fast-ruby#string-concatenation-code ✈️
32. -POH
    4USJOH
    -JUFSBMT "How kind of you to let me come!" + "Now once again, where does it rain?" + "On the plain! On the plain!" + "And where's that blasted plain? " + "In Spain! In Spain! The three " + "The rain in Spain stays mainly in the plain! " + "The rain in Spain stays mainly in the plain!"
33. -POH
    4USJOH
    -JUFSBMT "How kind of you to let me come!" \ "Now once again, where does it rain?" \ "On the plain! On the plain!" \ "And where's that blasted plain? " \ "In Spain! In Spain! The three " \ "The rain in Spain stays mainly in the plain! " \ "The rain in Spain stays mainly in the plain!"
34. Calculating ------------------------------------- String#+ 37.856k i/100ms String#backslash 144.338k i/100ms ------------------------------------------------- String#+ 480.091k (± 4.7%) i/s - 2.423M String#backslash 5.608M (± 8.4%) i/s - 27.857M Comparison: String#backslash: 5608274.5 i/s String#+: 480091.3 i/s - 11.68x slower
35. (KPFKPI4WD[6KRU 5
36. 3VCZ
    4UEMJC
    %PDT
    http://ruby-doc.org/stdlib-2.2.2/
37. http://thepugautomatic.com http://idiosyncratic-ruby.com http://www.rubytapas.com http://parley.rubyrogues.com
38. JuanitoFatas/fast-ruby JuanitoFatas/ruby-tips