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Perl使いの国のRubyist
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Takafumi ONAKA
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May 12, 2018
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Perl使いの国のRubyist
2018-05-12 RejectKaigi 2018
Takafumi ONAKA
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May 12, 2018
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Transcript
1FSM͍ͷࠃͷ3VCZJTU 3FKFDU,BJHJ େೳ࢙BLBJEPOL
ࣗݾհ w େೳ࢙BLBJEPOL w ݄·ͰυϦίϜͱ͍͏ձࣾͰ3BJMTΛॻ͍ ͍ͯ·ͨ͠ɻ3BJMTྺ͙Β͍ w ݄͔Βɺͯͳͱ͍͏ձࣾͰ1FSMΛॻ͍ͯ ͍·͢ɻ1FSMྺϲ݄ w
ࠓژ͔Βདྷ·ͨ͠
1FSMɻ
1FSMɻ w ʮઈରʹॻ͖ͨ͘ͳ͍ʯͱࢥ͍ͬͯΔਓ͕গͳ͘ͳ͍ͱࢥ͏ w ͦ͏Ͱͨ͠
1FSMɻ w ه߸ଟ͗͢Δ͠ ͱ͔!ͱ͔ͱ͔ w ޙ͚ͷΦϒδΣΫτࢦ͕ෆ֨ͩ͠ w Ҿ͕ແͯ͘!@͔ΒऔΓग़͞ͳ͖Ό͍͚ͳ͍͠
1FSMɻ w ਖ਼ɺژͷసډͱ͍͏ϥΠϑΠϕϯτ͕ແ͔ͬͨΒ·ͩ3VCZ ॻ͍͍ͯͨͱࢥ͍·͢ w Ͱ·͊ɺඈͼࠐΜ͔ͩΒʹຊؾͰΔΑɺͱ͍͏Θ͚Ͱɺࠓ ʮ1FSM͍ͷࠃͷ3VCZJTUʯͱ͍͏Λ͠·͢ w λΠτϧ:"1$"TJBͷ͋ΜͪΆ͘ΜΠϯεύΠΞ
ΞδΣϯμ w 3VCZ͔Β1FSM w ࠷ۙͷ1FSMͱ࠷ۙͷ3VCZ w 1FSMͱ3VCZͷܑఋؔ w 1FSMʹ׳ΕΔͨΊʹԿΛ͔ͬͨ w
։ൃ͍ͯͯ͠ϏοΫϦͨ͠ͱ͜Ζ w $1"/Ϟδϡʔϧฤ w ·ͱΊ
3VCZ͔Β1FSM w ʮ1FSM͔Β3VCZʯ͍ͬͯ͏ެࣜυΩϡϝϯτ
3VCZ͔Β1FSM w ͜ͷʮ1FSMͱͷྨࣅʯʮ1FSMͱͷҧ͍ʯ͕ʮ3VCZ͔Β1FSMʯͷ ཱͰศར w ݱͷ1FSMͰղܾ͍ͯ͠Δͱ͍͏ͷ͕ޙͰ͔ͬͨ
࠷ۙͷ1FSMͱ࠷ۙͷ3VCZ w DQBOUT IUUQTDQBOUTDQBOBVUIPSTPSH 2009 21070 2010 22227 2011
21910 2012 22647 2013 25760 2014 27272 2015 22999 2016 19982 2017 16352 2018 6052 => 17096 ϖʔε
࠷ۙͷ1FSMͱ࠷ۙͷ3VCZ w SVCZHFNTPSH IUUQTSVCZHFNTPSHQBHFTEBUB Version.group("TO_CHAR(created_at, 'YYYY')").count.sort # => [["2009",
39336], ["2010", 59267], ["2011", 82608], ["2012", 104318], ["2013", 125526], ["2014", 155369], ["2015", 132626], ["2016", 121681], ["2017", 108671], ["2018", 36498]] => 105485 ϖʔε
࠷ۙͷ1FSMͱ࠷ۙͷ3VCZ w ͲͪΒ͕ϐʔΫͰಷԽ͕ݟ͑·͢Ͷ w શظͷ͙Β͍ʁ w ଞͷݴޠௐͯͳ͍ΜͰ͕͢ɺؤு͍͖ͬͯ·͠ΐ͏
1FSMͱ3VCZͷܑఋؔ w ·ͩ8FC෦͔͠ݟͯͳ͍ͷͰଟ͘ޠΕ·ͤΜ͕
8FC։ൃͷྺ࢙ w $(*͙࣌Β͍ w ૉͷ$(* w ϦΫΤετΛड͚ΔͨͼʹQFSMΛىಈ͢Δ w "QBDIF NPE@QFSM
w QFSMࣗͷىಈίετ͕ແ͘ͳΔ
8FC։ൃͷྺ࢙ w 'BTU$(*͙࣌Β͍ w ΞϓϦέʔγϣϯΛGDHJରԠ͓͍ͯͯ͠ɺϓϩηεΛ্ཱͪ͛ଓ ͚Δ w "QBDIFͰ͋Δඞཁ͕ͳ͘ͳΓɺMJHIUUQE͕ྲྀߦΔ w 3BJMTY͙Β͍
w MJHIUUQE NPOHSFMͱ͔UIJOͱ͔ջ͔͍͠Ͱ͢Ͷ
8FC։ൃͷྺ࢙ w 84(*࣌ʙ w 3BDL։ൃ։͕࢝ W͕ w 3BJMTW͕ w 1MBDL։ൃ։͕࢝
W͕ w ʮϓϥοΫاۀʯ͕ྲྀߦޠͩͬͨͷ͕͙Β͍
3VCZπʔϧͱ1FSMQPSU w #VOEMFS w #VOEMFS w ։ൃ։͕࢝ W͕ w $BSUPO
w ։ൃ։͕࢝ W͕
3VCZπʔϧͱ1FSMQPSU w "OZFOW w SCFOW w QMFOW
3VCZπʔϧͱ1FSMQPSU w 8FC"QQMJDBUJPO4FSWFS w 6OJDPSO w 4UBSNBO 4UBSMFU w 8FC"QQMJDBUJPO4FSWFS
/PO#MPDLJOH w QVNB w 5XJHHZ
3VCZπʔϧͱ1FSMQPSU w ͷΑ͏ͳײ͡Ͱɺग़ࣗͦ͜1FSM͕3VCZͷܑ͓͞Μ ͓࢞͞Μ ͩ ͬͨͷͷɺ࠷ۙٯͷྲྀΕ͕ଟ͔ͬͨҹͰ͢
֓೦ͷมԽ͕ݮͬͨ w 3BJMT͔Β֓೦͕มΘΔΑ͏ͳେ͖ͳมߋ͕ͳ͍͠ɺ͔ͦ͜ Β8FCΞϓϦ։ൃࣗମ͕ਐԽ͕ࢭ·ͬͯΔҹ͕͋Δ w εϚϗΞϓϦ41"ੜ·Εͨ w +40/4DIFNBลΓಉ࣌ൃੜతʹʹΓ্͕ͬͯҰॹ ʹҭͬͨؾ͕͢Δ w
࠷ۙ(SBQI2-H31$͕Γ্͕͖͍ͬͯͯΔͷͰɺ։ൃ͠ ָ͍͍ͯͯ͠
ͯ͢ͷݟ͕ͦͷ··͑Δ w ͱ͍ͬͨลΓͰɺಛʹ8FC։ൃͷจ຺Ͱ·ͬͨ͘ಉ͡ݟ͕ ͑ΔͷͰۤ࿑͢Δ͜ͱແ͔ͬͨ w ڥߏங͢ΔͷʹSCFOWೖΕͯCVOEMFJOTUBMMͯ͠SBJMTTͱ͔ w ຊ൪ڥʹ8FCαʔόͱΞϓϦέʔγϣϯαʔό͕͋ͬͯɺ XPSLFSىಈͱ͔γάφϧૹͬͯ࠶ىಈͱ͔
1FSMʹ׳ΕΔͨΊʹԿΛ ͔ͬͨ
1FSMʹ׳ΕΔͨΊʹͬͨ͜ͱ w ॳΊͯͷ1FSMΛಡΜͩ w ͍ΘΏΔϦϟϚຊ w ʹୈ൛͕ग़͍ͯ·͢
1FSMʹ׳ΕΔͨΊʹͬͨ͜ͱ w )BUFOB5FYUCPPLΛಡΜͩ w ͜ΕͱʮॳΊͯͷ1FSMʯ͚ͩͰ࣮ίʔυ ͕ಡΊΔΑ͏ʹͳΔຊʹੌ͍ڭՊॻ w ಥવͷએ ࠓͷʮͯͳαϚʔΠϯλʔ ϯʯࣄલొडத
1FSMʹ׳ΕΔͨΊʹͬͨ͜ͱ w DBSUPOJOTUBMM࣌ʹย͔ͬΒHIRHFU͢Δ ϚϯΛॻ͍ͨ w HFNTSDͷQFSM൛ ޙʹDQBOHIRΛݟ ͚ͭΔʜʜ w
ϝλϑΝΠϧʹSFQPTJUPSZ͕ࡌͬͯͳ͍ $1"/Ϟδϡʔϧ͕݁ߏ͋Δ w Ұ୴ϦετΛ͚࣋ͬͨͲɺ13ͯ͠ճΒͳ ͍ͱͳ͊
1FSMʹ׳ΕΔͨΊʹͬͨ͜ͱ w BXFTPNFQFSMΛோΊͨ w )BDIJPKJQN w ࣾͷ()&͔Β৽͠Ίͷ1MBDLϓϩμΫτͷDQBOpMFΛूܭͯ͠ ோΊͨ w
3BJMT%FWFMPQFST.FFUVQͷͱ͖ͷ͚ΜͪΌΜ͘Μ͞Μͷε ΫϦϓτ͕ਆ
1FSMʹ׳ΕΔͨΊʹͬͨ͜ͱ w ͋ͱ࣮Ͱ&OVNFSBCMFͷϝιου܈Λ͍·͘Δͷͱɺςετ Λॻ͘ͷͱ w -JTU6UJM -JTU.PSF6UJMT -JTU6UJMT#Z w 5FTU
5FTU888.FDIBOJ[F14(* .PEVMF4QZ w ฏߦͯ͠ϝλϓϩάϥϛϯάͷษڧߦͬͨ w ͍ͬͯΔπʔϧͷ࣮ํ๏͕ਪଌͰ͖ΔΑ͏ʹͳΔ
։ൃ͍ͯͯ͠ϏοΫϦͨ͠ͱ ͜Ζ
@͕͋Δ w ҉తͳϒϩοΫม w ϓϩμΫτίʔυͰϒϩοΫม͕͙Β͍ෆཁʹ my $array = ["a", "b",
"c"]; for (@$array) { print $_ . "\n"; } my $array2 = [map { $_ . "foo"; } @$array];
͕͋Δ w EFpOFE͔Ͳ͏͔ͷԋࢉࢠ
͕͋Δ w Α͘ΔccͷϝϞԽ w GBMTZͳͩͱࠔΔ def foo @foo ||= heavy_method
end # heavy_method ͕ boolean Λฦ͢ͱ͖ʁ def foo return @foo if defined?(@foo) @foo = heavy_method end
͕͋Δ w MPHJDBMPSͱEFpOFEPS͕͋ΔͱεοΩϦ sub foo { shift->{_foo} //= heavy_method }
VTFͰSFRVJSFͱNJYJO w ϥΠϒϥϦଆʹGPP CBSΛ&91035͢Δͱॻ͍͓ͯ͘ͱ package Hoge; use parent 'Exporter'; our
@EXPORT = qw/foo bar/; sub foo { ... } sub bar { ... }
VTFͰSFRVJSFͱNJYJO w ͏ͱ͖ʹҙͷ͚ؔͩΛNJYJOͰ͖Δ package Fuga; use Hoge qw/foo/;
VTFͰSFRVJSFͱNJYJO w ͜Ε͓ͦΒ͘จԽతͳϞϊͰɺ1FSM3VCZͱҧͬͯؔܕ ݴޠͷॱ൪ͰݺͿͷͰʮΦϒδΣΫτʹϝιουΛੜ͢ʯͷͰ ͳ͘ɺʮϝιουΛNJYJOͯ͠͏ʯʹͳΔͷͩΖ͏ w ͦͯ͠ϝιου໊͕ॏෳ͠·͘ΔͷͰબΔΑ͏ʹͳ͍ͬͯΔ # perl reverse
uniq grep { $_ ~= /foo/ } <ARGV>; # ruby IO.read(ARGF).lines.grep {|l| l ~/foo/ }.uniq.reverse
είʔϓΛҙʹ࡞ΕΔ w ϨΩγΧϧείʔϓͱϦϑΝϨϯεΧϯτࣜ($ sub hoge { my $foo = 'foo';
my $bar = 'bar'; { my $foo = 'baz'; print $foo . $bar . "\n"; # => 'bazbar' } print $foo . $bar . "\n"; # => 'foobar' }
είʔϓΛҙʹ࡞ΕΔ w (VBSE͕͑Δ sub hoge { { # ͜ͷϒϩοΫͷதͰ͚ͩ memcached
্ཱ͕͕ͪΔ my $guard = Proc::Guard->new(command => ["memcached", "-p", "11211"]); # do something ... } # ͜͜Ͱ memcached ͕ఀࢭࡁΈ }
είʔϓΛҙʹ࡞ΕΔ w ҙʹείʔϓΛ࡞ΕΔͱ͜Μͳʹศརͳͷ͔ʔ w PQFOͨ͠ޙDMPTF͠ͳͯ͘είʔϓΛൈ͚ͨͱ͖ʹউखʹΫ ϩʔζ͞ΕΔ w 3VCZͩͱCMPDLͰݺͿ͚ͩͳͷ͚ͩΕͲʮൈ͚ͨͱ͖ʹσετ ϥΫλ͕ݺΕΔʯշײ
είʔϓΛҙʹ࡞ΕΔ w ֤ݴޠͰΈͳ͞Μؤுͬͯ·͢ w 3VCZͰείʔϓΛͣΕͨͱ͖ʹࣗಈͰԿ͔Λ͢ΔcUFDI൙ཞݪ w IUUQTMPXSFBMOFU w 5SBDF1PJOUͷɻ3VCZ,BJHJຊฤͷUBHPNPSJTKPLFSͷൃදΛָ͓͠Έʹ w
1)1Ͱ1FSMͰ͍͏ͱ͜Ζͷ(VBSEΛ͢ΔͰʂʂV[VMMB͕ϒϩά w IUUQV[VMMBIBUFCMPKQFOUSZ w 1FSMͷ4DPQF(VBSEΛ$PNNPO-JTQͰ࣮͢Δͧʂʂʂ-BNCEBΧΫςϧ w IUUQTXJOEZNFMUIBUFOBCMPHDPNFOUSZ
μΠφϛοΫείʔϓ͕͋Δ our $foo = 'foo'; sub print_foo { print $foo
. "\n"; } print_foo; # foo { local $foo = 'bar'; print_foo; # bar } print_foo; # foo
μΠφϛοΫείʔϓ͕͋Δ w είʔϓͱ͍ಓΛཧղͨ͠ͱ͖ʹ3VCZ͔Β1FSMʹΓସ Θͬͨײ͕͡͠·ͨ͠ɻΦϒδΣΫτͰͳͯ͘είʔϓΛ࿔Δͷ ͕1FSM8BZ
μΠφϛοΫείʔϓ͕͋Δ w 3VCZ,BJHJͷ࣭ίʔφʔͰEZOBNJDTDPQF ཉ͍͠ʂͬͯݴͬͨΒ.BU[ʹʮEZOBNJD TDPQFΛΘͳ͍ͨΊʹ3VCZΛ࡞͍ͬͯ Δʯͱ͑ΒΕͨͷͰϜγϟΫγϟͯͬ͠ ͨɻ w 1FSM͔Β3VCZʹདྷͨઌਓ͕ډΔͷͰʮͳΔ ΄Ͳͳ͊ʯͱͳΔ
࣮ߦ࣌ܕνΣοΫ͕ී௨ w 1FSMք࠷ۙ·ͰԾҾ͕ແ͔ͬͨͷͰɺҾΛड͚औΔํ๏Λ ͔Γ͘͢͢Δ$1"/Ϟδϡʔϧ͕։ൃ͞Εͨ sub foo { my ($num, $str)
= @_; print $num . "\n"; print $str . "\n"; } foo(1, "a");
࣮ߦ࣌ܕνΣοΫ͕ී௨ use Smart::Args::TypeTiny qw(args); sub create { args my $id
=> 'Id', my $title => 'Str', my $description => 'Maybe[Str]', my $comment => { isa => 'Str', optional => 1 }, # do something... } # ͏ͱ͖ hash Λ͢ create( id => 1, title => "title", description => undef, );
࣮ߦ࣌ܕνΣοΫ͕ී௨ w W ͰTVCGPP OVN TUS ͱॻ͚ΔΑ͏ʹͳͬͨ ͚ΕͲɺ)BTIΛͯ͠ܕνΣοΫΛߦ͏ํ͕ศརͳͷͰɺΘΕ ͳ͍ͱࢥ͏
ίϯςΫετ͕͋Δ my $a = localtime; my @b = localtime; use
Data::Dumper; print Dumper $a; # $VAR1 = 'Fri May 4 16:14:45 2018'; print Dumper @b; # $VAR1 = 45; # $VAR2 = 14; # $VAR3 = 16; # $VAR4 = 4; # $VAR5 = 4; # $VAR6 = '118'; # $VAR7 = 5; # $VAR8 = 123;
ίϯςΫετ͕͋Δ w TJ[F!BSSBZͰݸ͕औΕΔͷ͙͢׳ΕΔ͚ͲϏϏΔ w TDBMBSDPOUFYUͷதͰDPOUFYU͕͔Εɺԋࢉࢠ͕ܕΛ࣋ͭ Α͏ʹݟ͑Δ w Λ͏ͱΓ*OUʹͳΔ w
Λ͏ͱΓ͕4USʹͳΔ w +BWB4DSJQUͬΆ͍ w WBSOVN GPP w WBSTUSGPP
ίϯςΫετ͕͋Δ w WPJEDPOUFYUඇৗʹྑ͍ w ΓΛมʹೖΕ͍ͯΔ͔Ͳ͏͔͕ݺΕͨϝιου͔Β͔Δ w NBQ͡Όͳͯ͘FBDIΛ͑Έ͍ͨͳϠπ w ΓͷੜΛলུ͢Δ͜ͱͰύϑΥʔϚϯε্͕͛ΒΕΔ w
(VBSE༻ͷϝιουͰଋറΛΕ͍ͯͨΒౖΔͱ͔ w 3VCP$PQͰ-JOU7PJEDPQ͕ܯࠂग़ͯ͠·͢ w ڈ͍ͩͿݡ͘ͳͬͨͷͰ͍ͬͯͩ͘͞ɻQPDLF
TUSJDUNPEF͕͋Δ w NZΛ͚ͳ͍มએݴͷېࢭͱ͔ w ݅ࣜͰೖ͔Ͳ͏͔͕ݟ͚͍͢ w JG NZGPPCBS w
ϝλϓϩېࢭͱ͔ w Ұ෦͚ͩڐ༰͢Δ͜ͱ͕Ͱ͖Δ w ͚ͦͩ͜είʔϓΛ͚ͯڐՄͰ͖Δͷศར
TUSJDUNPEF͕͋Δ sub foo { print @_ . '\n'; } my
$method_name = 'foo'; { # ಈతʹϝιου໊Λܾఆͯ͠ݺͼग़͢ͷΛ͚ͩ͜͜ڐՄ no strict 'refs'; &{$method_name}('bar'); }
TUSJDUNPEF͕͋Δ w 3VCZʹTUSJDUNPEFΛೖΕΑ͏ͬͯఏ ҊɺਐḿͲ͏Ͱ͔͢
$1"/Ϟδϡʔϧฤ
ΩϥΩϥωʔϜ͡Όͳ͍ӕ w -81MJCXXXQFSMखڧ͔ͬͨ w 5IF4DIXBSU[.JOJPO͕+PC2VFVFͳͷ͔Δʁ w 5FTU.PSF 5FTU.PTUͱ͔ɺ-JTU 6UJMͱ͔ w
֮݁͑Ζ
5*.5085%*ແ͔ͬͨ͜ͱʹ ͍ͨ͠ w ۀίʔυ0OF8BZʹدͤΔͷ͕େਖ਼ٛ
QPE 4:/014*4 ͕ඞͣ͋Δ w ͜ΕຊʹૉΒ͍͠ɺ͕ w ࠷ۙ (JU)VCͷ͓͔͛Ͱ 3&"%.&NEʹ6TBHFΛࡌͤΔͷ͕ ී௨ʹͳͬͨ
QPE 4:/014*4 ͕ඞͣ͋Δ w 3VCZϦϑΝϨϯεϚχϡΞϧͷαϯϓϧίʔυΛίϐϖՄೳʹ͢Δ
ΔΓ·ߋ৽ͷ͖͔͚ͬ
ΔΓ·ߋ৽ͷ͖͔͚ͬ
ࠓ͙͢ࢀՃ
ࠓ͙͢ࢀՃ
.PEVMF$PSF-JTU w ߦҎ্ͷڊେ)BTIͰཧ͞Ε͍ͯΔ 5.027009 => { delta_from => 5.027008, changed
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