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
レガシーコードの触り方 / Working Effectively with Legacy Code
Search
Sponsored
·
SiteGround - Reliable hosting with speed, security, and support you can count on.
→
Takuto Wada
PRO
May 13, 2017
Programming
18k
79
Share
レガシーコードの触り方 / Working Effectively with Legacy Code
オープンセミナー2017@岡山
Takuto Wada
PRO
May 13, 2017
More Decks by Takuto Wada
See All by Takuto Wada
2026年のソフトウェア開発を考える(2026/05版) / Software Engineering Scrum Fest Niigata 2026 Edition
twada
PRO
23
13k
予防に勝る防御なし(2025年版) - 堅牢なコードを導く様々な設計のヒント / Growing Reliable Code PHP Conference Fukuoka 2025
twada
PRO
50
33k
SQLアンチパターン第2版 データベースプログラミングで陥りがちな失敗とその対策 / Intro to SQL Antipatterns 2nd
twada
PRO
46
43k
AI時代のソフトウェア開発を考える(2025/07版) / Agentic Software Engineering Findy 2025-07 Edition
twada
PRO
191
130k
技術選定の審美眼(2025年版) / Understanding the Spiral of Technologies 2025 edition
twada
PRO
118
110k
The Clean ArchitectureがWebフロントエンドでしっくりこないのは何故か / Why The Clean Architecture does not fit with Web Frontend
twada
PRO
87
51k
組織に自動テストを書く文化を根付かせる戦略(2024冬版) / Building Automated Test Culture 2024 Winter Edition
twada
PRO
37
15k
ピラミッド、アイスクリームコーン、SMURF: 自動テストの最適バランスを求めて / Pyramid Ice-Cream-Cone and SMURF
twada
PRO
10
3.8k
組織に自動テストを書く文化を根付かせる戦略(2024秋版) / Building Automated Test Culture 2024 Autumn Edition
twada
PRO
15
7.8k
Other Decks in Programming
See All in Programming
Back to the roots of date
jinroq
0
860
Lightning-Fast Method Calls with Ruby 4.1 ZJIT / RubyKaigi 2026
k0kubun
3
3.1k
ハーネスエンジニアリングとは?
kinopeee
13
7k
20260514_its_the_context_window_stupid.pdf
heita
0
1k
要はバランスからの卒業 #yumemi_grow
kajitack
0
170
エラー処理の温故知新 / history of error handling technic
ryotanakaya
7
1.9k
Agent Skills を社内で育てる仕組み作り
jackchuka
1
2k
KMP × Kotlin 2.3 - How Android Got Slower While iOS Builds Improved by 47%
rio432
0
200
Firefoxにコントリビューションして得られた学び
ken7253
2
160
新規プロダクトを高速で生み出すハーネスエンジニアリング
seanchas116
2
110
Spec-Driven Development with AI Agents (Workshop, May 2026)
antonarhipov
3
370
開発とはなにか、Essenceカーネルで見えるもの
ukin0k0
0
180
Featured
See All Featured
Speed Design
sergeychernyshev
33
1.7k
Agile that works and the tools we love
rasmusluckow
331
21k
Leveraging Curiosity to Care for An Aging Population
cassininazir
1
240
Between Models and Reality
mayunak
4
290
Put a Button on it: Removing Barriers to Going Fast.
kastner
60
4.3k
The Success of Rails: Ensuring Growth for the Next 100 Years
eileencodes
47
8.1k
Jess Joyce - The Pitfalls of Following Frameworks
techseoconnect
PRO
1
150
Building Better People: How to give real-time feedback that sticks.
wjessup
370
20k
Writing Fast Ruby
sferik
630
63k
Raft: Consensus for Rubyists
vanstee
141
7.4k
What the history of the web can teach us about the future of AI
inesmontani
PRO
1
560
A Guide to Academic Writing Using Generative AI - A Workshop
ks91
PRO
1
300
Transcript
ϨΨγʔίʔυͷ ৮Γํ ాਓ !U@XBEB .BZ !ΦʔϓϯηϛφʔԬࢁ
ాਓ JEUXBEB !U@XBEB HJUIVCUXBEB
None
ひとり歩きするスタンド ελϯυ໊ϫΠϧυɾαόϯφ
assert(typeof item.id === 'strong') | | | | | |
| false | | "foo" | Item{id:"foo",name:"bar"} "string" --- [string] 'strong' +++ [string] typeof item.id @@ -1,6 +1,6 @@ str -o +i ng https://github.com/power-assert-js/power-assert power-assert
ΑΖ͓͘͠ئ͍͠·͢
ݱ͔ΒͷதܧͰ͢
ർฐ͖ͬͨ͠ݱ
IUUQTXXXqJDLSDPNQIPUPTPLJOBXBTPCB ߥΈ͖ͬͨίʔυ
രॲཧͷΑ͏ͳϦϦʔε
ͭͷlͳΒΘ͠z
IUUQTXXXqJDLSDPNQIPUPTELBMP lςετΛॻ࣌ؒ͘ͳ͍z
ετϨε ςετ
ࣗಈςετ ετϨε
ςετΛॻ͕࣌ؒ͘ͳ͍ͷͰ ͳ͘ɺςετΛॻ͔ͳ͍͔ Β͕࣌ؒͳ͘ͳΔͷͰ͢ɻ
lಈ͘ίʔυʹ৮ΕΔͳz IUUQTXXXqJDLSDPNQIPUPT!/
&EJU1SBZࢮ͕͍ͬͯΔ
$PWFS.PEJGZ
w ʮςετΛॻ͕࣌ؒ͘ͳ͍ʯͷͰ ͳ͘ʮςετΛॻ͔ͳ͍͔Β͕࣌ؒ ͳ͘ͳΔʯ w ʮಈ͘ίʔυʹ৮ΕΔͳʯͱಆ͏ɻ ৮Βͳ͘ͱपΓ͕มΘͬͯಈ͔ͳ ͘ͳΔɻ৮Εͳ͚Είʔυ؇ ͔ʹࢮΜͰ͍͘ ͭͷʮͳΒΘ͠ʯͱಆ͏
ͭͷlಓ͠Δz
w ʮϨΨγʔίʔυͷδϨϯϚʯ w lίʔυΛมߋ͢ΔͨΊʹςετΛඋ͢Δ ඞཁ͕͋Δɻଟ͘ͷ߹ɺςετΛඋ͢Δ ͨΊʹɺίʔυΛมߋ͢Δඞཁ͕͋Δz w ϨΨγʔίʔυʹ৮ΔͨΊͷ ޠኮͱٕ๏Λཧͨ͠ຊ w
TUBDLPWFSqPXDPN͔Βͷ ඃݴٴୈҐ ϨΨγʔίʔυվળΨΠυ
w ϨΨγʔίʔυվળΨΠυΑΓந ͕ߴ͍ w ιϑτΣΞͷϦΤϯδχΞϦϯάΛߦ ͏ͭͷબࢶΛ͍ࣔͯ͠Δ w ϦϑΝΫλϦϯά w ϦΞʔΩςΫςΟϯά
w ϏοάɾϦϥΠτ ϨΨγʔιϑτΣΞվળΨΠυ
Ͳ͜ʹςετΛ ॻ͍͍͔ͯ͘
ʮ௧ΜͩՕॴʯͱʮख͕ಧ͘Ռ࣮ʯ
w ϦεΫ w खಈςετͷίετ w ࣗಈԽίετ ςετͷτϦΞʔδ
ςετέʔεΛҰཡʹ·ͱΊΔ ςετέʔε σβΠϯมߋ ηΩϡϦςΟΞϥʔτ औҾཤྺ ޱ࠲ͷౚ݁ ৽نϢʔβొ ݕࡧ݁Ռͷฒͼସ͑ ͓ۚͷೖۚ ৼΓࠐΈͷ֬ೝ
ϦεΫΛݟੵΔ ςετέʔε ϦεΫ σβΠϯมߋ ηΩϡϦςΟΞϥʔτ औҾཤྺ ޱ࠲ͷౚ݁ ৽نϢʔβొ ݕࡧ݁Ռͷฒͼସ͑ ͓ۚͷೖۚ
ৼΓࠐΈͷ֬ೝ
खಈςετͷίετΛݟੵΔ ςετέʔε ϦεΫ खಈςετͷ ίετ σβΠϯมߋ ηΩϡϦςΟΞϥʔτ औҾཤྺ ޱ࠲ͷౚ݁ ৽نϢʔβొ
ݕࡧ݁Ռͷฒͼସ͑ ͓ۚͷೖۚ ৼΓࠐΈͷ֬ೝ
ࣗಈԽίετΛݟੵΔ ςετέʔε ϦεΫ खಈςετͷ ίετ ࣗಈԽίετ σβΠϯมߋ ηΩϡϦςΟΞϥʔτ औҾཤྺ ޱ࠲ͷౚ݁
৽نϢʔβొ ݕࡧ݁Ռͷฒͼସ͑ ͓ۚͷೖۚ ৼΓࠐΈͷ֬ೝ
༏ઌॱҐΛ͚ͯฒସ͑Δ ςετέʔε ϦεΫ खಈςετͷ ίετ ࣗಈԽίετ ޱ࠲ͷౚ݁ ৼΓࠐΈͷ֬ೝ औҾཤྺ ݕࡧ݁Ռͷฒͼସ͑
͓ۚͷೖۚ ηΩϡϦςΟΞϥʔτ ৽نϢʔβొ σβΠϯมߋ
Ͳ͏ςετΛ ॻ͍͍͔ͯ͘
w ςετ͕ͳ͍ͷطʹઃܭ͕ѱ͍ஹީ w ઃܭ࣮Λม͑Δͷ͕લఏ w ࣮ͷςετΛॻ͔ͳ͍͜ͱ w ςετ͕Χόʔ͢Δൣғʹ༡ͼΛ࣋ͨ ͤɺΧόʔൣғΛϦϑΝΫλϦϯά w
ঢ়گʹԠͯ͡&&ςετΛ͍͜ͳ͢ ઃܭͷՄಈҬΛ֬อ͢Δ
w ࠷ॳ͔Βશ෦Ζ͏ͱ͠ͳ͍ w ςετۦಈʹͩ͜ΘΔͳ w ςετϑΝʔετʹͩ͜ΘΔͳ w ʮϢχοτʯςετʹͩ͜ΘΔͳ w ςετͷ࣮ߦʹͩ͜ΘΔͳ
w ςετͷཏੑʹͩ͜ΘΔͳ ͩ͜ΘΔͳ
w ྑ͍Ϣχοτςετͷࢦඪʹ༏ઌ ͕͋Δ w ࠶ݱɺ܁Γฦ͠Մೳ 3FQFBUBCMF w ಠཱ͍ͯ͠Δ *OEFQFOEFOU
w ଞͦΕ͔ΒͰ͍͍ ͩ͜ΘΖ͏
w ߹෦ͷݕ౼ͱۛຯ w ߜΓࠐΈͷൃݟͱґଘͷ w ࠶ݱੑ͋Δςετϋʔωεͷඋ w ूதฤू )ZQFSBXBSF&EJUJOH
w ίϯύΠϥ*%&·͔ͤ w ༷Խςετ w ࢼߦϦϑΝΫλϦϯά ϨΨγʔίʔυվળͷٕ๏ ৄ͘͠ σϞͰ
σϞطʹୀ৬ͨ͠ ઌഐ͕ॻ͍ͨ ṖͷίʔυΛҾ͖ܧ͙
IUUQTXXXqJDLSDPNQIPUPTUPNQBHFOFU ςετ࣭Λ্͛ͳ͍
w ࣭͕ʮΘ͔ΔʯΑ͏ʹͳΔ w Θ͔Δ͜ͱͦ͜େࣄ w ςετΛॻ͚ͩ͘Ͱɺྑ͘ͳΒͳ͍ w ମॏܭʹΔ͚ͩͰ૫ͤͳ͍ w ࣭Λ্͛Δͷઃܭͱϓϩάϥϛϯά
w ࠶ઃܭͱϦϑΝΫλϦϯάΛςετͰࢧ͑Δ ςετ࣭Λ্͛ͳ͍
lςετͰ্࣭͕Βͳ͍ Ͱ͢Αɻςετ͋͘·Ͱ ࣭Λ͋͛Δ͖͔͚ͬɻ࣭Λ͋ ͛ΔͷϓϩάϥϛϯάͰ͢ɻ ͜Εେੲ͔Βͦ͏ɻz
w ߹෦ͷݕ౼ͱۛຯ w ߜΓࠐΈͷൃݟͱґଘͷ w ࠶ݱੑ͋Δςετϋʔωεͷඋ w ूதฤू )ZQFSBXBSF&EJUJOH
w ίϯύΠϥ*%&·͔ͤ w ༷Խςετ w ࢼߦϦϑΝΫλϦϯά ͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠