5 Random Ruby Tips - Speaker Deck

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3VCZ5JQT 5

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,WCPKVQ(CVCU !

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@JuanitoFatas

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@JuanitoFatas

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@JuanitoFatas

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@JuanitoFatas

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0GY9CTPKPI UKPEG4WD[ 1

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$JSDVMBS"SHVNFOU3FGFSFODF&SSPS def foo(foo=foo) foo end < 2.2.2 => No problems at all >= 2.2.2 => warning: circular argument reference - foo

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$JSDVMBS"SHVNFOU3FGFSFODF&SSPS def foo(foo=foo()) foo end https://bugs.ruby-lang.org/issues/10314 Fixed

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0GY9CTPKPI UKPEG4WD[ 2 4GI'ZR

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-JUFSBM /http:\/\/ruby.sg/ %r{http://ruby.sg}

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Character Properties http://ruby-doc.org/core-2.2.2/Regexp.html#class-Regexp-label-Character+Properties

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\p{} $POTUSVDU

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\p{Letter} -FUUFS a, b, c

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\p{Mark} .BSL bon appétit qué pasa Köln

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\p{Number} /VNCFS 1, 2, 3

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\p{Punctuation} 1VODUVBUJPO , ; .

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\p{Word} 8PSE Letter, Mark, Number, Connector_Punctuation

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\p{Symbol} 4ZNCPM + = |

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\p{Han} .BUDI$IJOFTF if your application goes to China

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\p{Hiragana,Katakana} .BUDI+BQBOFTF

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\p{Hangul} .BUDI,PSFBO

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3 'PWOGTCDNG

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users.sort { |a, b| a.balance <=> b.balance } users.sort_by(&:balance) TPSUWTTPSU@CZ

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> 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

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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

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users.sort_by(&:balance).take 3 NJO@CZWTTPSU@CZ users.min_by 3, &:balance R uby 2.2

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> 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

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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

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4 5VTKPI

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$PODBUFOBUJPO "foo" + "bar" "foo".concat "bar" "foo" << "bar" "foo" "bar" JuanitoFatas/fast-ruby#string-concatenation-code ✈️

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-POH4USJOH-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!"

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-POH4USJOH-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!"

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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

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(KPFKPI4WD[6KRU 5

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3VCZ4UEMJC%PDT http://ruby-doc.org/stdlib-2.2.2/

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http://thepugautomatic.com http://idiosyncratic-ruby.com http://www.rubytapas.com http://parley.rubyrogues.com

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JuanitoFatas/fast-ruby JuanitoFatas/ruby-tips