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
Trap Questions in Java and Obj-C
Search
417.72KI
December 03, 2019
Programming
1
290
Trap Questions in Java and Obj-C
417.72KI
December 03, 2019
Tweet
Share
More Decks by 417.72KI
See All by 417.72KI
Reboot a personal app abandoned for 10 years with recent techs
417_72ki
0
31
iTunes・おぼえていますか〜ScriptingBridge今昔物語〜
417_72ki
1
36
The history of entry-point in iOS app Development
417_72ki
0
390
R.swift to Asset Symbols
417_72ki
0
280
Refactor with using `available` and `deprecated`
417_72ki
3
630
CLIツールにSwift Concurrencyを適用させようとしている話
417_72ki
3
420
CI with Danger-Swift
417_72ki
1
200
Graduation from Playground beginner
417_72ki
3
910
ダックタイピングとidでUserDefaultsをモック化する
417_72ki
2
2.5k
Other Decks in Programming
See All in Programming
Domain-Driven Transformation
hschwentner
2
1.9k
Ruby on cygwin 2025-02
fd0
0
150
Pulsar2 を雰囲気で使ってみよう
anoken
0
240
Lottieアニメーションをカスタマイズしてみた
tahia910
0
130
ファインディLT_ポケモン対戦の定量的分析
fufufukakaka
0
870
仕様変更に耐えるための"今の"DRY原則を考える
mkmk884
8
2.6k
Code smarter, not harder - How AI Coding Tools Boost Your Productivity | Angular Meetup Berlin
danielsogl
0
100
Rubyで始める関数型ドメインモデリング
shogo_tksk
0
130
データベースのオペレーターであるCloudNativePGがStatefulSetを使わない理由に迫る
nnaka2992
0
220
ARA Ansible for the teams
kksat
0
160
責務と認知負荷を整える! 抽象レベルを意識した関心の分離
yahiru
8
1.2k
color-scheme: light dark; を完全に理解する
uhyo
7
470
Featured
See All Featured
For a Future-Friendly Web
brad_frost
176
9.5k
Fantastic passwords and where to find them - at NoRuKo
philnash
51
3k
Building Better People: How to give real-time feedback that sticks.
wjessup
367
19k
Thoughts on Productivity
jonyablonski
69
4.5k
XXLCSS - How to scale CSS and keep your sanity
sugarenia
248
1.3M
Reflections from 52 weeks, 52 projects
jeffersonlam
348
20k
Navigating Team Friction
lara
183
15k
Building an army of robots
kneath
303
45k
Cheating the UX When There Is Nothing More to Optimize - PixelPioneers
stephaniewalter
280
13k
How GitHub (no longer) Works
holman
314
140k
Into the Great Unknown - MozCon
thekraken
35
1.6k
Fashionably flexible responsive web design (full day workshop)
malarkey
406
66k
Transcript
4XJGU,PUMJOѪձ 7PM !(.0ϖύϘ
4XJGUͱ,PUMJO
4XJGUͱ,PUMJO
+BWBͱ0CKFDUJWF$ ͷΛ͠·͢
ͳΜͰࠓ͞Β+BWB0CK$
ͳΜͰࠓ͞Β+BWB0CK$ w ࠓͷ࣌ΞϓϦ4XJGU,PUMJOͰॻ͘ͷ͕ͨΓલ w ࠓͲ͖+BWB0CK$ͳΜͯ৮ΒΜΖ
Ռͨͯ͠ຊʹͦ͏ͩΖ͏͔ʁ
Ռͨͯ͠ຊʹͦ͏ͩΖ͏͔ʁ w 044ϥΠϒϥϦϦϦʔε͞Εͨ࣌ϥΠϒϥϦͷಛ ੑ্+BWB0CK$Ͱॻ͔Ε͍ͯΔͷ·ͩ·ͩଟ͍ w ࣮Λ֬ೝͨ͠Γ13Λग़ͨ͠Γ͢ΔͳΒͬͺΓͦͷล ͷࣝඞཁ
ͱ͍͏͜ͱͰ
ҙ֎ͱҾ͔͔ͬΔʂʁ ݴޠ༷ΫΠζ +BWB0CKFDUJWF$ฤ
w 5BLVIJSP.VUBBLB໊Նر ,* w 4& 8FC J04 "OESPJE ৽ਓݚमߨࢣFUD
J04 डୗ։ൃ J04 ࣗࣾ։ൃ ࠓίί w 5XJUUFS 2JJUB@LJ (JU)VC,* w 4XJGUѪձࢀՃप ͏ΜΧϨʔ ͓લ୭Α
#VJME$POpHTXJGU ελʔ͍ͩ͘͞
ݴޠ༷ΫΠζ w +BWB w 0CKFDUJWF$
+BWBฤ
ୈ
࣍ͷίʔυͷಈ͖Ͳ͏ͳΔʁ
࣍ͷίʔυͷಈ͖Ͳ͏ͳΔʁ public class Sample { public static void main(String... args)
{ while (false) { System.out.println("hoge"); } } }
࣍ͷίʔυͷಈ͖Ͳ͏ͳΔʁ public class Sample { public static void main(String... args)
{ while (false) { System.out.println("hoge"); } } } lIPHFz͕ճ͚ͩग़ྗ͞ΕΔ Կى͖ͳ͍ ίϯύΠϧΤϥʔ ࣮ߦ࣌Τϥʔ
࣍ͷίʔυͷಈ͖Ͳ͏ͳΔʁ public class Sample { public static void main(String... args)
{ while (false) { System.out.println("hoge"); } } } lIPHFz͕ճ͚ͩग़ྗ͞ΕΔ Կى͖ͳ͍ ίϯύΠϧΤϥʔ ࣮ߦ࣌Τϥʔ
ղઆ public class Sample { public static void main(String... args)
{ while (false) { System.out.println("hoge"); } } } 6OSFBDIBCMFDPEF
ୈ
ୈΛ౿·͑ͯ public class Sample { public static void main(String... args)
{ while (false) { System.out.println("hoge"); } } }
࣍ͷίʔυͷಈ͖Ͳ͏ͳΔʁ public class Sample { public static void main(String... args)
{ do { System.out.println("hoge"); } while (false); } }
࣍ͷίʔυͷಈ͖Ͳ͏ͳΔʁ public class Sample { public static void main(String... args)
{ do { System.out.println("hoge"); } while (false); } } lIPHFz͕ճ͚ͩग़ྗ͞ΕΔ Կى͖ͳ͍ ίϯύΠϧΤϥʔ ࣮ߦ࣌Τϥʔ
࣍ͷίʔυͷಈ͖Ͳ͏ͳΔʁ public class Sample { public static void main(String... args)
{ do { System.out.println("hoge"); } while (false); } } lIPHFz͕ճ͚ͩग़ྗ͞ΕΔ Կى͖ͳ͍ ίϯύΠϧΤϥʔ ࣮ߦ࣌Τϥʔ
public class Sample { public static void main(String... args) {
do { System.out.println("hoge"); } while (false); } } ղઆ EPXIJMFࣄޙධՁ ճॲཧͨ͠ޙʹ݅ࣜΛఆ
ղઆ ॲཧ ݅ XIJMF ॲཧ ݅ EPXIJMF
0CKFDUJWF$ฤ
ୈ
Կ͕ग़ྗ͞ΕΔʁ
Կ͕ग़ྗ͞ΕΔʁ if (@0) { NSLog(@"true"); } else { NSLog(@"false"); }
Կ͕ग़ྗ͞ΕΔʁ if (@0) { NSLog(@"true"); } else { NSLog(@"false"); }
USVF GBMTF
Կ͕ग़ྗ͞ΕΔʁ if (@0) { NSLog(@"true"); } else { NSLog(@"false"); }
USVF GBMTF
ղઆ w @0</4/VNCFSOVNCFS8JUI*OU>ͷ4ZOUBY4VHBS w /4/VNCFSΦϒδΣΫτ w ΦϒδΣΫτͱͯ͠ଘࡏ͢ΔͨΊɺ USVFͱͯ͠ఆ͞ΕΔ w @NOಉ༷
ୈ
Կ͕ग़ྗ͞ΕΔʁ
Կ͕ग़ྗ͞ΕΔʁ [ "hoge", "fuga", null, "foo", "bar" ] TBNQMFKTPO NSArray
*array = ... // JSONΛಡΈࠐΉॲཧ if (array[2]) { NSLog(@"true"); } else { NSLog(@"false"); }
Կ͕ग़ྗ͞ΕΔʁ USVF GBMTF [ "hoge", "fuga", null, "foo", "bar" ]
TBNQMFKTPO NSArray *array = ... // JSONΛಡΈࠐΉॲཧ if (array[2]) { NSLog(@"true"); } else { NSLog(@"false"); }
Կ͕ग़ྗ͞ΕΔʁ USVF GBMTF [ "hoge", "fuga", null, "foo", "bar" ]
TBNQMFKTPO NSArray *array = ... // JSONΛಡΈࠐΉॲཧ if (array[2]) { NSLog(@"true"); } else { NSLog(@"false"); }
ղઆ w /4"SSBZͷίϨΫγϣϯʹOJMΛೖΕΔ͜ͱ͕Ͱ͖ͳ ͍ w େମखஈͱͯ͠/4/VMMͱ͍͏ΫϥεΛ͏ w ͜ͷ࣌BSSBZ<>͔ΒऔΓग़͞ΕΔͷ</4/VMMOVMM>ͱ͍͏ γϯάϧτϯΦϒδΣΫτ w
ΦϒδΣΫτͳͷͰUSVFͱͯ͠ఆ͞ΕΔ
/4/VMMͱOJM NSLog(@"%@", nil); // -> (null) NSLog(@"%@", [NSNull null]); //
-> <null> ྻʹฆΕ͍ͯΔOVMMΑ͘ݟམͱ͕ͪ͠
͜ΜͳΜͬͯͯԿʹͳΔʁ
͜ΜͳΜͬͯͯԿʹͳΔʁ w +BWB w 0$+1 0SBDMFೝఆࢿ֨ Ͱ͜͏͍͏͕ग़͞ΕΔ w ࣮Ͱ͏ҙຯ໓ଟʹແ͍͕ɺ ϨΨγʔͳγεςϜͰۃكʹฆΕࠐΜͰΔ
w ϦʔμϒϧίʔυͬͯͬͯΔʁ
͜ΜͳΜͬͯͯԿʹͳΔʁ w 0CK$ w ҙ֎ͱݟམͱ͕ͪ͠ w ͜ͷखͷޡղ͔ΒੜͣΔόά͕࣮ࡍʹ͋ͬͨ w 4XJGUͷϦϓϨʔεͰఆͱҧ͏ಈ͖Λ͢Δͱ͔ w
ಛʹྻʹฆΕࠐΉOVMM͋Δ͋Δ
͜ΜͳΜͬͯͯԿʹͳΔʁ w ͍ͭͰʹ w ৽ਓݚमͰυϠΕΔ
·ͱΊ w ϨΨγʔݴޠͷཧղϦϓϨʔεͷڧ͍ຯํ w ࢥΘ͵όάΛੜ·ͳ͍ͨΊʹݴޠ༷ͷཧղେ w ࣮ͰΘͳ͍͔ࣝͩΒͬͯܰࢹ͠ͳ͍Α͏ʹ
ྑ͍͓Λʂ✋