Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
怠惰なRubyistへの道 - Enumerator::Lazy の使いかた@福岡Ruby会議01
Search
nagachika
December 02, 2012
Programming
5
2.2k
怠惰なRubyistへの道 - Enumerator::Lazy の使いかた@福岡Ruby会議01
福岡Ruby会議01での発表資料を公開用にPDFに変換したものです。アニメーションやデモの動画はスライドによる説明に置き換えています。
nagachika
December 02, 2012
Tweet
Share
More Decks by nagachika
See All by nagachika
Functional Music Composition
nagachika
1
690
ruby trunk changes 統計版
nagachika
3
260
怠惰なRubyistへの道 - Enumerator::Lazy の使いかた
nagachika
17
7.6k
Ruby Kaja のご提案
nagachika
8
2.1k
Other Decks in Programming
See All in Programming
オープンソースコントリビュート入門
_katsuma
0
130
generative-ai-use-cases(GenU)の推しポイント ~2025年4月版~
hideg
1
390
七輪ライブラリー: Claude AI で作る Next.js アプリ
suneo3476
1
190
Orleans + Sekiban + SignalR でリアルタイムWeb作ってみた
tomohisa
0
240
flutter_kaigi_mini_4.pdf
nobu74658
0
150
The Missing Link in Angular’s Signal Story: Resource API and httpResource
manfredsteyer
PRO
0
140
파급효과: From AI to Android Development
l2hyunwoo
0
160
カオスに立ち向かう小規模チームの装備の選択〜フルスタックTSという装備の強み _ 弱み〜/Choosing equipment for a small team facing chaos ~ Strengths and weaknesses of full-stack TS~
bitkey
1
140
Browser and UI #2 HTML/ARIA
ken7253
2
180
Beyond_the_Prompt__Evaluating__Testing__and_Securing_LLM_Applications.pdf
meteatamel
0
110
AIコーディングエージェントを 「使いこなす」ための実践知と現在地 in ログラス / How to Use AI Coding Agent in Loglass
rkaga
4
1.3k
ウォンテッドリーの「ココロオドル」モバイル開発 / Wantedly's "kokoro odoru" mobile development
kubode
2
500
Featured
See All Featured
A Tale of Four Properties
chriscoyier
159
23k
Rebuilding a faster, lazier Slack
samanthasiow
81
9k
RailsConf & Balkan Ruby 2019: The Past, Present, and Future of Rails at GitHub
eileencodes
137
33k
A better future with KSS
kneath
239
17k
GraphQLの誤解/rethinking-graphql
sonatard
71
10k
YesSQL, Process and Tooling at Scale
rocio
172
14k
Navigating Team Friction
lara
185
15k
GraphQLとの向き合い方2022年版
quramy
46
14k
Build your cross-platform service in a week with App Engine
jlugia
230
18k
Thoughts on Productivity
jonyablonski
69
4.6k
Principles of Awesome APIs and How to Build Them.
keavy
126
17k
Facilitating Awesome Meetings
lara
54
6.3k
Transcript
ଵଦͳ3VCZJTUͷಓ &OVNFSBUPS-B[Zͷ͍͔ͨ $IJLBOBHB5PNPZVLJ !OBHBDIJLB 'VLVPLBSC 'VLVPLB3VCZ,BJHJ
"HFOEB &OVNFSBCMF &OVNFSBUPS &OVNFSBUPS-B[Z
"HFOEB &OVNFSBCMF ͷ৽ػೳ /&8 &OVNFSBUPS &OVNFSBUPS-B[Z
"55&/5*0/ ࠓͷ 3VCZͷ ৽ػೳʹ͍ͭͯ
3VCZ ϦϦʔε༧ఆ <SVCZEFW>ΑΓ "VHCJHGFBUVSFGSFF[F 0DUGFBUVSFGSFF[F 'FCSFMFBTF 3VCZͷੜप
3VCZ "VHCJHGFBUVSFGSFF[F 0DUGFBUVSFGSFF[F /PWQSFWJFXSFMFBTFE ˡࠓίί %FDQSFWJFXSFMFBTFE 'FCSFMFBTF
JTJO EFWFMPQNFOU ˞˞ ༷։ൃதͷͷͰ͋Γ ϦϦʔε൛Ͱมߋ͞ΕΔ߹͕͋Γ·͢
*OTUBMM3VCZ ͰະདྷΛ֞ؒݟΔ SWN SCFOWΛ͍ͬͯΕ SWNJOTUBMMSVCZIFBE SCFOWJOTUBMMEFWFM
4FMG*OUSPEVDUJPO UXJUUFSJE!OBHBDIJLB SVCZUSVOLDIBOHFT IUUQEIBUFOBOFKQOBHBDIJLB $3VCZDPNNJUUFS :PLPIBNBSCˠ'VLVPLBSC 4PVOESC SVCZDPSFBVEJP SVCZQVSFEBUB
3FDFOU"DUJWJUZ 3%PDˠ 3VCZ(FNTˠ 3BLFˠ 3BLF .JOJ5FTUˠ ۭલͷϝδϟʔόʔδϣϯΞοϓϥογϡ
3FDFOU"DUJWJUZ ͔͚͜Έίϛοτϥογϡ
/FX'FBUVSFT ΩʔϫʔυҾ .PEVMFQSFQFOE 3FGJOFNFOU &OVNFSBUPS-B[Z %5SBDFରԠ 5SBDF1PJOU "SSBZCTFBSDI ($CJUNBQNBSLJOH %FCVHHFS1SPGJMFS
"1* εΫϦϓτΤϯίʔσΟϯά 65'Խ 4USJOHC
,FZXPSE"SHVNFOUT EFGUVQQMF LFZlBz WBMVFlCz \LFZWBMVF^ FOE UVQQMFLFZlLz WBMVFlWz \lLzzWz^ UVQQMFWBMVF\lBz^
UVQQMF\lBzlCz^
.PEVMFQSFQFOE DMBTT$JODMVEF.FOE .PEVMFJODMVEF .JYJO ఆٛࡁΈͷϝιουΛ্ॻ͖Ͱ͖ͳ͍ C M Object obj DMBTT$QSFQFOE.FOE
.PEVMFQSFQFOE$ͷϝιουΛ্ॻ͖Ͱ͖Δ "SPVOE"MJBT BMJBT@NFUIPE@DIBJO ͷ͔ΘΓʹ͑Δ C M Object obj
.PEVMFQSFQFOE NPEVMF5JUMF EFGJOJUJBMJ[F UJUMF OBNF !UJUMFUJUMF TVQFS OBNF FOE EFGOBNF
!UJUMF TVQFS FOE FOE DMBTT1FSTPO EFGJOJUJBMJ[F OBNF !OBNFOBNFFOE EFGOBNF !OBNF FOE QSFQFOE5JUMF FOE 1FSTPOOFX l.Sz lOBHBDIJLBz OBNFl.SOBHBDIJLBz
.PEVMFQSFQFOE QSFQFOEͳͩ͠ͱ JODMVEFͩͱ DMBTT1FSTPO FOE NPEVMF5JUMF FOE DMBTT.FO1FSTPO
JODMVEF5JUMF EFGJOJUJBMJ[F TVQFS !UJUMFl.Sz FOE FOE
3FGJOFNFOU େ෯ ࿏ઢ มߋ
!B@NBUTVEB
&OVNFSBUPS-B[Z
&OVNFSBUPS-B[Z ͷલʹ
&OVNFSBCMF
&OVNFSBCMF ͪΖΜͬͯ·͢ΑͶ
"SSBZ )BTI *0 "SSBZ)BTI *0 &OVNFSBCMFΛ JODMVEF͍ͯ͠Δ
&OVNFSBCMF ʲܗ༰ࢺʳ͑ΒΕΔ<ຊޠ8PSE/FU ӳ ՄࢉʀՄ൪<Ϋϩεϥϯήʔδઐޠࣙॻ> $BQBCMFPGCFJOHFOVNFSBUFE DPVOUBCMF<8JLJUJPOBSZ>
&OVNFSBCMF ʮFBDIϝιουΛݺͿͱɺԿ͔͕ ॱʹ /ճ ZJFMEͰ͞ΕΔʯ ͱ͍͏ϧʔϧ /
&OVNFSBCMF FBDIϝιου͕ఆٛ͞Εͯ ͍ΔΫϥεʹJODMVEFͯ͠ ͏ .JYJO
&OVNFSBCMF FBDI͚ͩ༻ҙ͓͚ͯ͠ NBQ TFMFDU SFKFDU HSFQ FUD ͱ͍ͬͨϝιου͕͑ΔΑ͏ʹͳΔ ͜ΕΒͷϝιου͕FBDIΛͬͯ ࣮͞Ε͍ͯΔ
"O&YBNQMF DMBTT" JODMVEF&OVNFSBCMF EFGFBDI ZJFME ZJFME ZJFME FOE FOE "OFXNBQ\]J]J
^< >
͜͜·Ͱͷ·ͱΊ &OVNFSBCMFFBDIϝιουΛͬͯ ଟ࠼ͳϝιουΛՃ͢Δ ͳʹ͕ʮ্͑͛ΒΕΔʯͷ͔ FBDIϝιου͕ͲͷΑ͏ʹ ZJFMEΛݺͼग़͔͢Ͱܾ·Δ
&OVNFSBUPS &OVNFSBUPS ͬͯ·͢
&OVNFSBUPS FBDIʹ͢ϒϩοΫΛอཹͨ͠ ঢ়ଶͰΦϒδΣΫτͱͯ࣋ͪ͠ճΔ
UP@FOVN FOVN@GPS &OVNFSBUPSͷ࡞Γ͔ͨ w &OVNFSBUPSOFX PCK NFUIPEFBDI BSHT w
PCKUP@FOVN NFUIPEFBDI BSHT w PCKFOVN@GPS NFUIPEFBDI BSHT w &OVNFSBUPSOFX\]Z]^ ˢ͜Ε͚ͩͪΐͬͱಛघ
0CKFDUFOVN@GPS FBDIҎ֎ͷҙͷϝιουͷݺͼग़͠Λ &OVNFSBUPSʹͰ͖Δ ࣮&OVNFSBCMFͰͳ͍͍ͯ͘ F@CZUFTUEJOFOVN@GPS FBDI@CZUF όΠτ͝ͱʹZJFME F@MJOFTUEJOFOVN@GPS FBDI@MJOF ߦ͝ͱʹZJFME
&OVNFSBUPSOFX\]Z]^ F&OVNFSBUPSOFX\]Z] Z ZGPP Z ^ ϒϩοΫ͕FBDIͷΘΓɻ ϒϩοΫύϥϝʔλZʹ͢Δͱ ZJFME͢Δ͜ͱʹͳΔɻ
&OVNFSBUPSOFX\]Z]^ DMBTT" EFGFBDI ZJFME ZJFMECBS ZJFME FOE FOE "OFXUP@FOVN ͱಉ͡
&OVNFSBUPSBT &YUFSOBM*UFSBUPS ֎෦ΠςϨʔλͱͯ͑͠Δ F UP@FOVN FOFYUFBDI͕ZJFME͢Δ͕ FOFYUॱʹOFYUͰऔΓग़ͤΔ FOFYU FOFYU
4UPQ*UFSBUJPOJUFSBUJPOSFBDIFEBOFOE
.FUIPE$IBJO NBQ TFMFDUͳͲҰ෦ͷϝιουϒϩο ΫΛলུ͢Δͱ&OVNFSBUPSΛฦ͢ͷͰ ෳͷϝιουΛΈ߹Θͤͯ͏ BSZNBQXJUI@JOEFY\]W J]^
.FUIPE$IBJO <B C D E>NBQXJUI@JOEFYEP]TZN J] JFWFO TZNJ FOE
<B D > &OVNFSBUPS ಠࣗͷϝιου
XJUI@JOEFY <SVCZEFW>.BU[XSPUF lNBQ͕FOVNFSBUPSΛฦ͢ͱ PCKNBQXJUI@JOEFY\]Y J]^ ͕Ͱ͖Δͷ͕خ͍͠ͷͰಋೖͨ͠ͷͰͨ͠ɻͱ͍͏Θ͚Ͱɺ FBDIʹNBQʹXJUI@JOEFY͕͚ΒΕͯخ͍͠ ͱ͍͏ͷ͕ຊͷཧ༝Ͱ͢ɻz
4FDSFU4UPSZPG &OVNFSBUPS &OVNFSBUPS XJUI@JOEFYͷҝʹ ੜ·Εͨ
͜͜·Ͱͷ·ͱΊ w&OVNFSBUPS w֎෦ΠςϨʔλԽ wϝιουνΣʔϯ w
&OVNFSBUPS-B[Z ͷ৽ػೳ
&OVNFSBUPS-B[Z &OVNFSBUPSͷαϒΫϥε
&OVNFSBCMFMB[Z &OVNFSBUPS-B[Zͷ࡞Γ͔ͨ &OVNFSBCMFMB[ZΛݺͿ MB[Z &OVNFSBUPS-B[Z
&OVNFSBUPS-B[Z -B[ZͷNBQ TFMFDU [JQͳͲҰ෦ͷϝιο υ͕͞Βʹ-B[ZΛฦ͢ MB[ZNBQ\]J]J ^ &OVNFSBUPS-B[Z
&OVNFSBUPS-B[ZNBQ
&OVNFSBUPS-B[Z > Enumerator::Lazy.instance_methods(false) map collect flat_map collect_concat select find_all reject
grep zip take take_while drop drop_wihle cycle lazy force [ruby 2.0.0dev (2012-05-30 trunk 35844)]
GPSDF &OVNSBUPS-B[ZGPSDF UP@BͷBMJBT Ԇ͞Ε͍ͯΔΠςϨʔλͷධՁΛ࣮ߦ
"-B[Z%FNP >> l = (0..5).lazy => <Enumerator::Lazy: 0..5> >> l_map
= l.map{|i| p i; i * 2 } => <Enumerator::Lazy: #<Enumerator::Lazy: 0..5>:map> # ͜ͷ࣌Ͱ·ͩϒϩοΫͷ༰࣮ߦ͞Ε͍ͯͳ͍! >> l_map.force 0 1 2 3 4 5 => [0, 2, 4, 6, 8, 10] # force ΛݺͿͱ࣮ߦ͞ΕΔ
&OVNFSBUPSͱͷҧ͍ .FUIPE$IBJOͷ͍͔͕ͨΑΓڧྗʹ தؒσʔλͷ੍
1JUGBMMPG &OVNFSBUPS NBQ TFMFDUͷΑ͏ʹϒϩοΫͷΓ Λར༻͢ΔϝιουΛෳܨ͛Δ͜ͱ͕Ͱ ͖ͳ͍ ͯ͠ҙຯ͕ͳ͘ͳΔ NBQTFMFDU\]J]J^
< > ˢNBQͷҙຯ͕ͳ͘ͳ͍ͬͯΔ
5SVF.FUIPE$IBJO NBQTFMFDUͱ͍ͬͨϝιου͍ͭ͘Ͱ .FUIPE$IBJOͰ͖Δɻ ͦ͏ɺ-B[ZͳΒͶɻ ͔Βͷ͏ͪҙͷܻʹΛؚΉΛฦ͢ MB[ZNBQ UP@T TFMFDU\]T] _T
^GPSDF
1JUGBMMPG &OVNFSBUPS NBQ TFMFDUͷΑ͏ʹϒϩοΫͷΓ Λར༻͢ΔϝιουΛ֎෦ΠςϨʔλԽ͠ ͯҙຯ͕ͳ͍ F NBQ
FOFYU FOFYU FOFYU FOFYU ˢNBQͷҙຯ͕ͳ͘ͳ͍ͬͯΔ
5SVF&YUFSOBM *UFSBUPS NBQͳͲʹϒϩοΫΛͤΔͷͰ ద༻ͨ݁͠ՌΛॱʹऔΓग़ͤΔ M MB[ZTFMFDU\]J]JFWFO ^ MOFYU MOFYU
MOFYU
&GGJDJFOU.FNPSZ 6TBHF -B[ZZJFMEຖʹ.FUIPE$IBJOͷ ࠷ޙ·Ͱॲཧ͞ΕΔ
&OVNFSBCMFWFSTJPO MBSHF@BSSBZNBQ\^TFMFDU\^
&OVNFSBCMFWFSTJPO MBSHF@BSSBZNBQ\^TFMFDU\^ NBQ
&OVNFSBCMFWFSTJPO MBSHF@BSSBZNBQ\^TFMFDU\^ NBQ TFMFDU
&OVNFSBCMFWFSTJPO MBSHF@BSSBZNBQ\^TFMFDU\^ NBQ TFMFDU ($͞ΕΔ
&OVNFSBCMFWFSTJPO MBSHF@BSSBZNBQ\^TFMFDU\^ NBQ TFMFDU ($͞ΕΔ map ݁ՌͷͨΊ large_array ͱಉ͘͡Β͍ͷ தؒσʔλ͕ඞཁ
-B[ZWFSTJPO MBSHF@BSSBZMB[ZNBQ\^TFMFDU\^GPSDF
-B[ZWFSTJPO MBSHF@BSSBZMB[ZNBQ\^TFMFDU\^GPSDF
-B[ZWFSTJPO MBSHF@BSSBZMB[ZNBQ\^TFMFDU\^GPSDF ($`FE
-B[ZWFSTJPO MBSHF@BSSBZMB[ZNBQ\^TFMFDU\^GPSDF
-B[ZWFSTJPO MBSHF@BSSBZMB[ZNBQ\^TFMFDU\^GPSDF ($`FE
-B[ZWFSTJPO MBSHF@BSSBZMB[ZNBQ\^TFMFDU\^GPSDF
-B[ZWFSTJPO MBSHF@BSSBZMB[ZNBQ\^TFMFDU\^GPSDF தؒσʔλ͕ෆཁ
-B[Z$IBJO%FNP >> (0..4).lazy.select{|i| p “select:#{i}”; i.event? }.map{|i| p “map:#{i}”; i
* 2 }.force “select:0” “map:0” “select:1” “select:2” “map:2” “select:3” “select:4” “map:4” => [0, 4, 8]
-B[ZXJUI*0 ྫ TUEJO͔ΒۭߦΛಡΉ·Ͱͷ֤ߦͷ จࣈͷྻΛฦ͢ TUEJOMB[ZUBLF@XIJMF\]M] MDIPNQFNQUZ ^NBQ\]M]MDIPNQTJ[F^
-B[ZXJUI*0 &OVNFSBCMF &OVNFSBUPSͩͱۭߦ·Ͱઌ ʹಡΜͰ͠·͏ɻ -B[ZͳΒߦಡΉͨͼʹUBLF@XIJMFNBQ ͷϒϩοΫ͕࣮ߦ͞ΕΔ ˠஞ࣍ॲཧͰ͖Δ
-B[Z-JTU ແݶʹଓ͘ཁૉΛѻ͑Δ MJTU 'MPBU*/'*/*5: MJTUNBQ\]J]J ^UBLF ฦͬͯ͜ͳ͍ MJTUMB[ZNBQ\]J]J ^UBLF
GPSDF < >
*OUFSBDUJWJUZ ࣮ߦॱংΛར༻ͯ͠ΠϯλϥΫςΟϒʹ 'MPBU*/'*/*5: MB[ZNBQ\]J] QOVN MJOFTUEJOHFUT MJOFDIPNQJGMJOF ^UBLF@XIJMF\]M] MBOEOPUMFNQUZ ^GPSDF
1JUGBMMPG-B[Z ϝϞԽ͞Εͳ͍ GPSDFΛճݺͿͱ͏ҰFBDI͕ ݺΕΔ *0ͳͲ෭࡞༻ͷ͋ΔFBDIͩͱ݁Ռ͕ มԽ͢Δ FY TUEJOMB[ZUBLF
FOVN@GPSͷΑ͏ʹFBDIͷ͔ΘΓʹͳ ΔϝιουΛࢦఆͰ͖ͳ͍ TUEJOFOVN@GPS FBDI@CZUF MB[Z TUEJOMB[Z FBDI@CZUF ͱॻ͖͍ͨ
-B[ZBTB#FUUFS &OVNFSBUPS -B[Z &OVNFSBUPSͷ ਖ਼౷ਐԽ൛
)BQQZ-B[Z 1SPHSBNNJOH