Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Sign up for free
Menu
Search
Features
All features
Private URLs
Password Protection
Custom URLS
Scheduled publishing
Remove Branding
Restrict embedding
Deck Collections
Notes
Features
All features
Private URLs
Password Protection
Custom URLS
Scheduled publishing
Remove Branding
Restrict embedding
Deck Collections
Notes
Explore
Featured decks
Featured speakers
Programming
Technology
Storyboards
Explore
Featured decks
Featured speakers
Programming
Technology
Storyboards
Pricing
Search
Sign in
Sign up for free
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
2.3k
5
Share
Embed
Copy iframe code
Copy JS code
Copy link
Start on current slide
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
More Decks by nagachika
See All by nagachika
ruby.wasm で作る MIDI コントローラー
nagachika
1
130
Pure Intonation on Browser: Building a Sequencer with Ruby
nagachika
1
1.2k
Functional Music Composition
nagachika
1
790
ruby trunk changes 統計版
nagachika
3
350
怠惰なRubyistへの道 - Enumerator::Lazy の使いかた
nagachika
17
7.7k
Ruby Kaja のご提案
nagachika
8
2.3k
Other Decks in Programming
See All in Programming
iOS開発×AI駆動開発 〜最近使って便利だったスキルの話〜
nogu66
0
140
ALB ログから Trace を気合で繋げる技術
fohte
7
880
App Storeの外へ──日本のiOSサイドローディング入門 for iOSDC Japan 2026
yuukiw00w
0
130
世界の中心で、AI(App Intents)をさけぶ ー App Intents中心設計の実践ガイド
touyou
0
250
まだ間に合う!今年の夏こそSchemeのマクロ展開器を完全理解!
omasanori
0
640
FastAPI の並行処理モデルを完全に理解する
hoto17296
9
3.9k
AWS DevOps Agentで インシデント対応をAIに任せたい
honmarkhunt
7
2.7k
コンパウンドプロダクト開発のためのローカルプロセスマネージャー再発明 #layerxgo
izumin5210
0
660
MIZARU@SPAJAM2026 第二回予選
1901drama
0
110
モバイル交通系ICへのチャージ実例から考える、クロスプラットフォーム開発におけるiOS実機テスト設計とCI運用
yusuga
1
250
高専キャリア LT 発表内容
crysta1221
6
5.6k
型解析で実現する Go の言語内 DSL / Conference に Go! タイムテーブルの歩き方 for Gophers
mazrean
0
140
Featured
See All Featured
Winning Ecommerce Organic Search in an AI Era - #searchnstuff2025
aleyda
1
2.1k
Claude Code のすすめ
schroneko
67
230k
Marketing to machines
jonoalderson
1
5.8k
Product Roadmaps are Hard
iamctodd
55
13k
4 Signs Your Business is Dying
shpigford
187
23k
RailsConf 2023
tenderlove
30
1.5k
Impact Scores and Hybrid Strategies: The future of link building
tamaranovitovic
0
440
Bridging the Design Gap: How Collaborative Modelling removes blockers to flow between stakeholders and teams @FastFlow conf
baasie
0
690
A Tale of Four Properties
chriscoyier
163
24k
Intergalactic Javascript Robots from Outer Space
tanoku
273
27k
I Don’t Have Time: Getting Over the Fear to Launch Your Podcast
jcasabona
35
2.8k
Art, The Web, and Tiny UX
lynnandtonic
304
22k
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