< the repositories. Below is the list of repositories.
|Github addresses|
|----------------|
|https://github.com/Alamofire/Alamofire|
|https://github.com/fullstackio/FlappySwift/|
|https://github.com/SwiftyJSON/SwiftyJSON/|
|https://github.com/MengTo/Spring/|
|https://github.com/robb/Cartography/|
|https://github.com/Ramotion/animated-tab-bar|
|https://github.com/Quick/Quick/|
|https://github.com/SnapKit/SnapKit/|
|https://github.com/lexrus/LTMorphingLabel/|
|https://github.com/ankurp/Dollar.swift/|
|https://github.com/JakeLin/SwiftWeather/|
|https://github.com/onevcat/Kingfisher|
|https://github.com/duemunk/Async|
|https://github.com/typelift/Swiftz|
|https://github.com/vikmeup/SCLAlertView-Swift|
|https://github.com/stephencelis/SQLite.swift|
|https://github.com/realm/SwiftLint|
|https://github.com/nghialv/MaterialKit|
|https://github.com/SwiftBond/Bond|
|https://github.com/uacaps/PageMenu|
|https://github.com/Hearst-DD/ObjectMapper|
|https://github.com/thoughtbot/Argo|
|https://github.com/ReactiveX/RxSwift|
|https://github.com/yoavlt/LiquidFloatingActionButton|
|https://github.com/Moya/Moya|
|https://github.com/nickoneill/PermissionScope|
|https://github.com/icanzilb/EasyAnimation|
|https://github.com/krzyzanowskim/CryptoSwift|
|https://github.com/Draveness/DKChainableAnimationKit|
|https://github.com/matthewpalmer/Locksmith|
|https://github.com/vandadnp/iOS-8-Swift-Programming-Cookbook|
|https://github.com/daltoniam/SwiftHTTP|
|https://github.com/ReactKit/SwiftTask|
|https://github.com/gitdoapp/SugarRecord|
|https://github.com/entotsu/TKSubmitTransition|
The interview script can be found [here](interview-script.txt).
## Gathering StackOverflow data
We gather StackOverflow data using the [StackExchange](https://data.stackexchange.com/stackoverflow) database. For simplifying purposes [here](db-scripts.zip) is the list of scripts that duplicates our dataset in a MySQL database.
We used the MySQL Workbench 6.3 CE. The scripts have to be run in the following order:
Order | Script
------|-------
1 | swift-sql-create
2 | swift-users
3 | swift-topics-hyper
4 | swift-questions
5 | swift-answers
6 | swift-questions-topics-hyper
7 | swift-comments1
8 | swift-comments2
9 | swift-named_topics-hyper
10 | swift-update_named_topics-hyper
## List of LDA Topics (with words)
The result of the LDA processing is a list od 25 topics. Next we provide them in full details.
Topic | Share | Questions | Most Relevant | LDA Words
------|-----------|-----------|---------------|----------
Error/General | 7.5% | 36.7% | 13.5% | code work swift problem fine function issu wrong call work_fine
UI/Navigation | 5.0% | 15.5% | 44.7% | view control view_control segu bar viewcontrol navig storyboard tab back
Error/Debugging | 4.5% | 16.5% | 32.9% | error swift code type line compil crash messag argument issu
Q&A | 4.5% | 22.0% | 14.8% | swift question find answer solut make document appl read understand
Data Storage | 4.4% | 14.6% | 41.3% | arrai data object dictionari save core core_data swift store creat
OO Programming | 4.3% | 15.3% | 34.7% | class method call swift protocol type subclass implement creat deleg
Data Types | 4.1% | 13.4% | 38.2% | string swift function type number convert return int paramet charact
Objective-C Interop.| 3.8% | 11.8% | 41.0% | swift c objective objective_c framework project import header object_c object
UI/TableView | 3.7% | 12.0% | 43.4% | cell tabl tableview view row tabl_view uitableview custom select section
IDE/Xcode | 3.6% | 13.5% | 30.8% | xcode file project swift beta build xcode_beta error creat test
iOS Testing | 3.5% | 13.2% | 30.5% | app io devic iphon simul run applic crash io_app work
UI/Positioning | 3.5% | 10.6% | 43.9% | view size height constraint scroll set screen width layout uiview
UI/Actions | 3.4% | 12.8% | 31.1% | button click press keyboard tap action user swift uibutton custom
Cloud/Social Media | 2.9% | 9.4% | 42.0% | user pars notif app login facebook queri log messag post
Image Handling | 2.9% | 10.1% | 36.6% | imag color background chang photo set camera uiimag pictur uiimageview
Networking | 2.8% | 8.8% | 44.3% | json data request server swift api respons url alamofir send
Game Development | 2.8% | 7.2% | 55.9% | game scene node sprite spritekit screen player move score make
Variables Def/Use | 2.5% | 9.6% | 29.9% | variabl properti swift access set declar struct refer assign object
UI/Animations | 2.4% | 8.1% | 37.0% | anim move draw swipe gestur touch left screen uiview rotat
Noise/General Words | 2.2% | 9.6% | 23.0% | search swift list io creat select user app tutori appreci
Multithread/Sched. Func | 2.2% | 8.7% | 28.8% | call function time updat load complet data block run thread
Optionals/Nil | 2.2% | 8.5% | 29.1% | option nil print return statement unwrap error check found unwrap_option
UI/Text | 2.0% | 8.0% | 28.0% | text label field crash line uilabel font text_field chang set
Media/Time Comp. | 2.0% | 6.0% | 48.7% | plai date video time sound timer audio record swift dai
Location/Web Comp. | 1.7% | 5.8% | 42.0% | locat map user annot page googl url webview html uiwebview
## List of Optional questions analyzed
To select the questions related to optionals, we ran this query:
```sql
SELECT DISTINCT
q.id_question,
q.creationDate,
q.score,
q.viewCount,
q.answerCount,
q.commentCount,
q.favoriteCount,
q.tags,
q.id_selected_answer,
t.value
FROM
Questions q, Questiontopics t
WHERE
t.id_question = q.id_question AND
q.processedBody like '% option %' AND
q.bodyText not like '% option %' AND
q.bodyText not like '%options%' AND
q.titleText not like '% option %' AND
t.id_topic = 12
order by t.value desc
```
The complete result list of optional-related questions is available [here](list-optional-questions). We analyzed only the 3rd quartile of questions, ordered by the LDA value. These questions are listed below:
question|score|views|answers|comments|favorites|tags|value
--------|-----|-----|-------|--------|---------|----|-----
29730819|-2|80|2|3|0|ios, swift|0.9229827595
28882954|0|376|1|0|0|swift, nsurl, nsurlrequest|0.9228847788
31622771|-2|85|1|1|0|iphone, swift, optional|0.9228847788
24948302|2|7981|4|2|0|ios, swift|0.9086496585
29487926|1|153|1|1|0|ios, swift, fatal-error|0.8990279601
28647816|0|151|1|1|0|swift, ios8|0.8904822286
26736944|0|481|3|0|1|ios, swift, ios8|0.8736277499
32234375|0|24|1|6|0|swift|0.8601592678
31223402|0|57|1|8|0|ios, swift, null, xcode6, optional-values|0.854490173
24053246|3|276|5|0|1|swift, optional|0.8478958749
30500336|-1|241|3|3|1|ios, swift|0.8410019413
26625254|0|152|2|0|0|swift|0.8300316642
30952294|1|166|1|3|0|swift|0.823796391
25523305|5|4882|1|0|3|swift, boolean, optional|0.817770605
25287263|0|400|1|3|0|swift|0.8174353817
27743774|2|119|1|2|0|ios, swift, optional, forced-unwrapping|0.8053058508
29055637|-1|57|1|2|0|swift, uiviewcontroller|0.8028226507
25947782|0|456|1|0|0|swift|0.7923355953
31774193|0|50|2|5|0|swift|0.7923355953
26860829|0|102|2|2|0|swift, ios8, optional|0.7900121376
27370700|0|107|2|0|1|swift, swiftype|0.7764588777
25484883|3|1571|1|1|1|swift, var, println|0.7734338879
27556911|2|6990|1|2|2|xcode, osx, swift, input|0.7674491203
28665375|0|157|2|1|0|swift, optional, forced-unwrapping|0.7596972233
31350308|0|42|1|0|0|ios, swift, object, core-data, predicate|0.7473111662
28046614|2|67|1|1|0|swift, optional|0.7441873459
31143806|0|51|1|0|0|swift, terminology|0.7441873459
25986585|0|408|1|0|0|ios, xcode, swift|0.7433257991
25489267|1|1716|4|6|0|swift, apple, optional|0.7405136946
25394749|1|654|1|0|0|swift|0.7334065428
27169737|1|72|2|1|0|swift, optional|0.7334065428
29051588|0|154|3|0|0|xcode, swift, null, xcode-6.2|0.7334065428
30371215|3|148|3|1|0|ios, swift, uiimagepickercontroller|0.7334065428
32277847|-2|48|2|2|0|ios, swift|0.7316120281
32157667|1|48|1|0|1|swift, optional, swift-playground|0.7309903333
26615711|-2|204|2|9|2|if-statement, swift, syntax, assignment-operator, optional|0.722781232
31989157|-6|62|1|2|1|ios, swift, swift2|0.722781232
32003983|1|58|3|0|0|ios, swift, optional-chaining|0.722781232
29512430|-1|68|1|3|0|swift, optional|0.7205175704
32518568|0|25|0|2|0|ios, iphone, swift, type-conversion|0.7157028414
24481931|2|275|3|0|0|swift, optional|0.713441494
24143679|1|186|2|1|0|uikit, swift|0.7130407591
30333378|0|180|1|5|0|ios, swift, parse.com|0.7126533284
29069559|-1|237|1|3|0|ios, swift|0.7119158141
28404719|1|108|1|2|0|xcode, swift, cllocationmanager|0.7062710078
25612254|0|67|2|0|0|swift|0.7045755481
32453499|1|40|0|6|0|swift|0.7045755481
28997804|1|104|2|4|0|swift|0.6976311878
32645612|4|87|2|2|1|swift|0.6952892887
32571512|-1|31|1|3|0|swift, fatal-error, optional|0.6949314178
27382030|0|40|2|0|0|ios, swift|0.6876879088
29816349|1|95|2|3|0|ios, xcode, swift|0.6854218859
31690216|0|336|1|0|0|ios, xcode, swift|0.6846106585
24369955|1|322|3|0|0|swift|0.6831649211
31461376|0|33|3|1|0|ios, xcode, swift, optional|0.680546876
29388468|0|42|2|2|0|swift|0.6796442823
30030784|0|159|2|3|0|swift, sprite-kit|0.6796442823
27956010|-4|70|1|16|0|ios, swift|0.6791350197
25192427|0|2328|1|0|0|ios, string, swift, nsurl, optional|0.6774640863
31737826|0|80|1|8|0|swift, nsmutablearray, optional|0.6726698884
25979969|1|320|2|2|0|swift|0.6699451084
27991187|0|833|1|2|0|swift, uiimageview|0.6692162166
30960948|-1|55|2|2|0|swift|0.6692162166
27732151|1|335|2|4|0|image, swift, ios8, xcode6, addressbook|0.6675842231
27094651|0|844|1|0|0|swift, ios-simulator, avaudioplayer, nserror, ipad-mini|0.6602127164
28970787|0|144|4|4|1|ios, arrays, swift|0.6600958226
28925157|1|321|2|1|0|ios, uitableview, swift|0.6591059158
32086230|0|42|2|1|0|xcode, swift, optional|0.6577416329
32607618|0|29|0|4|0|ios, xcode, swift|0.6575409244
24163716|1|377|1|0|1|swift, optional-variables|0.6566524227
30090102|0|86|1|2|0|ios, swift|0.6557938947
31094744|0|28|0|0|0|swift, uitableview|0.6544621832
28570587|1|87|1|0|0|swift|0.6527587196
27454893|-2|96|1|1|0|swift|0.6510943182
26600229|2|1146|1|0|0|swift, plist|0.650502588
32104072|0|35|2|0|0|ios, iphone, xcode, swift, uiimagepickercontroller|0.650502588
24454686|2|41|0|5|1|ios, swift|0.6492664844
26348250|-2|531|2|3|0|ios, swift|0.6472085099
30068200|1|83|2|0|0|xcode, swift, return, avfoundation, optional|0.6471570957
30370085|1|86|1|2|0|xcode, swift, for-loop, core-bluetooth, optional|0.6459674908
30808370|0|34|1|0|0|swift, xcode6|0.6452292803
28662198|1|47|1|0|0|swift|0.6444657202
31719234|0|59|1|5|0|ios, swift, uitableview, viewwithtag|0.6428018138
28551225|0|114|2|2|0|swift|0.6397543981
31999852|2|35|1|2|0|ios, swift, optional|0.6351788167
24482076|1|50|2|0|0|swift|0.6340486305
25828301|1|3205|3|2|0|if-statement, swift|0.6340486305
30692012|2|99|2|0|0|swift, boolean, optional|0.632778359
24177850|0|423|2|1|0|swift, nsset, optional-values|0.6321614253
24712371|1|1109|3|1|0|swift, null, optional|0.6321614253
26348996|0|2166|1|0|0|swift, null, optional|0.6321614253
26881838|0|1131|2|0|1|swift, ios8, ios8.1|0.6321614253
27205889|0|834|1|1|0|swift|0.6305239228
24788870|1|435|2|0|0|ios, swift, optional|0.6304732919
32775814|0|39|3|0|0|ios, swift|0.629495907
29058088|1|399|2|0|0|ios, swift, mkmapview, cllocationmanager|0.6287904877
30692691|0|30|1|2|0|ios, xcode, swift, optional|0.6237388783
33049246|0|34|2|0|0|swift|0.6230427765
33058700|1|20|1|2|0|ios, swift, xcode7|0.6230427765
27734612|2|891|3|0|2|swift, optional-chaining|0.6222363071
30631322|0|64|1|0|0|swift, xcode6, compiler-warnings, optional-values, forced-unwrapping|0.6217707796
27005092|-2|204|1|6|0|uitableview, swift, uitabbarcontroller|0.6206790132
32131159|0|18|2|1|0|xcode, swift, parse.com, optional|0.6206790132
24544025|0|167|2|1|0|ios, uiimage, swift|0.6184719444
32967084|0|26|2|3|0|ios, swift, swift2|0.6171324117
26113703|0|1021|1|1|0|ios, swift, settings.bundle, user-preferences|0.6152305167
24481859|3|802|2|0|0|swift|0.6151012187
25834799|-2|997|1|3|0|swift, xcode6|0.6136350778
27121523|0|2322|0|5|0|xcode, swift, label|0.6114168321
30917115|0|37|1|3|0|ios, swift, parse.com|0.6113235408
30880969|2|77|2|2|2|swift, objective-c-nullability|0.6099778333
31556060|0|88|1|1|0|ios, xcode, swift, optional|0.6096821402
30814592|4|108|1|4|0|swift, forced-unwrapping|0.6091776696
24395511|0|182|1|0|1|swift|0.6081226515
24548999|18|5582|6|1|1|swift, optional|0.6081226515
26613195|1|554|3|0|2|swift, syntax, variable-assignment, conditional-statements, optional|0.6076728144
31855182|0|51|4|1|0|swift, optional, optional-binding|0.6062330943
27809789|0|917|2|1|0|ios, swift|0.6042539278
31496971|1|67|2|0|1|swift|0.6033190451
24230427|2|250|3|3|2|swift, optional-variables|0.6019419298
32803313|-1|60|3|6|0|xcode, swift, optional|0.6019419298
32529905|0|34|1|0|0|swift, gyroscope, core-motion|0.6015102657
29711806|-2|93|1|3|0|ios, swift, optional|0.6012356074
31661244|0|60|0|9|0|ios, objective-c, swift, debugging|0.5986384001
28986480|1|49|1|0|0|swift, optional|0.5982846783
28681991|0|133|1|0|0|ios, swift, xcode6, icloud, cloudkit|0.5971894907
32969664|0|27|3|1|0|ios, swift|0.5971894907
30361981|2|227|3|2|0|swift, optional|0.5957960511
24232193|0|58|1|3|0|swift|0.595106634
30339205|0|53|2|1|0|ios, swift|0.595106634
25422536|2|2198|2|11|0|ios, swift, tableview, iboutlet|0.5943706711
27882009|0|672|1|2|1|swift, ios8, nsdata, nsurl|0.5943706711
28355041|0|317|1|0|0|swift, ios8|0.5932215251
29221293|0|59|3|0|0|uitableview, swift, optional, optional-chaining|0.5914828779
31265955|2|46|1|3|0|ios, swift, uipageviewcontroller, snapshot|0.5914828779
28530652|4|269|1|5|0|ios, swift, optional|0.5899700365
24459171|3|3044|2|0|1|switch-statement, swift, tuples, optional|0.5895648515
28417313|-1|225|2|2|0|ios, swift, uiviewcontroller|0.5895648515
29835099|-2|180|1|4|0|ios, swift, optional|0.5875704216
28704528|0|148|1|5|0|swift, null|0.5869859088
29974019|0|837|1|8|0|ios, swift, parse.com|0.5850308851
32682144|0|37|1|3|0|ios, swift, uilabel|0.5830495116
25526720|0|31|1|1|0|swift|0.5829702817
27475809|1|464|1|0|0|swift, mapkit|0.5829702817
28596287|0|997|1|2|0|swift|0.5801348321
32101920|0|24|1|1|0|xcode, swift|0.5784177918
32302831|1|33|1|0|0|ios, swift|0.5784177918
27100603|-1|447|1|9|0|parsing, swift, xcode6|0.5778077372
27964095|-2|312|1|3|0|ios, swift|0.5748789744
26576366|2|170|2|0|1|if-statement, swift, optional|0.5743645609
30136182|-3|301|5|0|1|ios, swift, null, optional|0.5737932966
26675490|4|9687|2|0|1|ios, iphone, xcode, swift|0.5733599368
26844241|0|221|0|1|1|swift|0.5733599368
24272781|2|443|3|0|0|ios, swift, ios8, optional|0.5702701202
32021748|0|40|2|4|0|swift|0.5699520333
31764762|1|30|1|0|0|swift, closures, optional|0.5693931479
32769421|0|38|1|0|0|ios, iphone, swift, alamofire|0.5693931479
30981518|0|28|0|3|0|ios, swift, compiler-errors, uicollectionview|0.5661957262
26755978|1|321|3|0|0|ios, image-processing, swift, uiimage, vimage|0.5661000221
27998409|3|3735|2|6|2|ios, iphone, swift|0.5658333441
32102549|0|34|3|0|0|swift, nsmutabledictionary, optional|0.5658333441
26110207|1|196|1|1|1|ios, design-patterns, swift, optional|0.5654007238
26643190|3|113|1|0|0|swift|0.565024653
29056737|0|53|1|0|0|xcode, swift, core-data|0.5626983945
25289637|2|304|1|0|0|ios, swift|0.5626209478
28864499|2|174|2|1|0|string, swift, optional|0.5626209478
26640210|2|1139|1|0|0|swift, swift-playground|0.5625679202
32106299|1|89|4|0|0|ios, swift|0.5604649317
25195565|2|399|2|1|2|swift, ios8, optional|0.5597074691
26510971|1|64|1|0|0|dictionary, printing, swift|0.5580518427
31026967|0|31|1|0|0|switch-statement, where, optional, swift-playground|0.5580518427
24073669|1|213|2|0|0|swift|0.5570530407
26994834|1|208|2|0|0|reflection, swift|0.5570530407
32701824|1|30|1|0|0|ios, swift, swift2, ios9|0.5537334575
26019929|1|129|3|0|0|ios, uiviewcontroller, swift|0.5521884407
27868103|4|3504|1|0|0|ios, swift|0.5505581551
27875245|-1|277|1|2|0|swift|0.5484391584
28917116|0|102|1|0|0|xcode, swift, error-handling, fatal-error, skproduct|0.5474928228
27670004|0|180|1|0|0|swift, cmmotionmanager|0.5447779438
30954013|-1|26|1|4|0|swift|0.5423566678
32105808|-2|31|1|7|0|swift|0.5423566678
28331094|0|86|1|2|0|xcode, swift, post|0.5420851344
31623196|0|35|3|2|0|swift, optional, unwrap|0.5420851344
29316217|0|69|2|2|0|ios, swift, optional-variables|0.5401838102
31041661|1|34|2|0|0|ios, iphone, swift|0.5382230057
24006975|207|19536|8|0|79|swift|0.5372047835
30151172|-1|64|1|3|0|ios, swift|0.5367744793
24149740|0|263|1|0|0|swift|0.5364446565
24244535|0|274|2|0|1|swift|0.5361565704
32555640|1|35|0|6|0|ios, swift, uilabel|0.5351658039
31810660|0|69|4|0|0|swift|0.5348244282
32898688|0|18|0|5|0|ios, swift, segue, iboutlet|0.5348244282
30667663|1|48|1|2|0|ios, swift, cocos2d-iphone, physics|0.5346320076
26910229|2|1069|2|0|2|swift, boolean, evaluation, optional|0.5333421296
30928710|1|24|1|0|0|ios, xcode, swift|0.5333421296
24647442|0|117|2|0|2|swift, optional-variables|0.531980867
31460395|8|98|2|1|0|swift, null, swift2|0.5316920833
26359427|1|55|1|0|0|ios, swift, optional|0.5309282996
24877098|4|2706|1|0|1|swift|0.5307263971
27295894|1|580|1|1|0|ios, uitableview, swift, xcode6, reloaddata|0.5307263971
28057471|0|64|0|2|0|ios, swift, view|0.5307263971
27088546|0|59|1|0|0|xcode, swift, type-conversion, optional, optional-values|0.5299750969
25306229|0|253|1|0|0|xcode, swift, ios8|0.5295666273
28640685|1|77|1|0|0|xcode, swift, uilabel, segue|0.5295666273
33029040|0|24|1|0|0|facebook, swift, facebook-graph-api, alamofire, swifty-json|0.5295666273
27362398|0|144|2|0|0|ios, swift, optional|0.5295060973
27878793|1|48|0|3|0|swift, optional, syntactic-sugar|0.5284912243
29054096|0|98|2|0|0|swift, optional-values|0.5269999069
31647328|-2|41|1|2|0|ios, iphone, swift, ios9|0.5246507676
26733333|0|670|1|0|1|ios, swift|0.5227093121
26018578|-2|59|2|0|0|ios, xcode, swift|0.5209970514
27109894|6|730|4|0|0|ios, swift|0.5209970514
31329198|0|85|1|3|1|swift, fatal-error|0.5209970514
31549454|1|36|2|2|0|swift, parse.com, optional|0.5209970514
31126680|0|16|2|0|0|ios, swift, parse.com|0.5188782286
24091729|6|1199|2|0|1|swift|0.5182866233
24643522|34|79561|9|2|8|ios, swift, uicollectionview, wrapping|0.5182866233
27145392|0|362|3|0|0|ios, swift|0.5182866233
31730342|0|133|1|5|0|ios, xcode, swift|0.518010135
24204606|2|2665|2|6|0|swift|0.5164932855
26524246|7|429|3|2|3|swift, optional|0.5145342764
29779722|0|46|0|2|0|ios, xcode, swift|0.5138250636
26176199|0|87|1|2|0|ios, xcode, sqlite, swift, optional|0.5131818438
32256834|11|302|2|0|2|swift, swift2|0.5131818438
25202770|12|3904|3|7|1|swift, expression|0.513166546
26363050|1|210|2|0|0|ios, swift, optional-values|0.5125958156
32735233|0|62|2|0|0|swift, nsfilemanager|0.5125958156
31540810|0|38|1|0|0|arrays, swift, sprite-kit|0.511113579
28256695|1|744|5|8|0|swift, conditional-operator|0.5106584125
29472149|2|1697|4|0|1|ios, xcode, swift, url, xcode6|0.5103051285
24876858|2|409|2|2|0|swift|0.509943463
26619699|0|105|3|0|0|ios, swift, optional-values|0.509943463
30833316|0|40|1|4|0|ios, xcode, swift|0.508996272
27494041|5|1272|1|2|0|swift, asynchronous, parse.com, optional|0.5073603113
29360779|0|90|0|1|0|ios, xcode, swift, null|0.5066674707
25112540|3|1315|2|0|0|swift|0.504762272
31236419|-1|103|1|4|0|ios, swift, debugging, nsdictionary, optional|0.4962957336
31136407|0|36|1|0|1|swift|0.4959494987
24685558|1|401|1|5|0|xcode, swift, uisplitviewcontroller|0.4957921779
31629413|-2|34|1|0|0|ios, swift2|0.4957921779
29910349|0|79|1|0|0|swift|0.4953396609
30259632|0|251|1|2|0|ios, web-services, swift, rest|0.495130177
31375141|0|78|2|3|0|ios, swift|0.494900974
27867575|0|416|1|13|0|ios, xcode, swift, fatal-error, iboutlet|0.4937183695
31715210|1|36|1|0|0|swift, terminology, optional|0.4937183695
30955401|0|63|0|0|0|swift|0.4928943743
28311316|-2|45|3|1|0|ios, swift|0.4926534528
28653646|0|205|1|3|0|ios, swift, nsdata, optional|0.4921190328
24153120|5|868|2|1|0|ios, swift, xcode6|0.4915007609
27654037|1|1248|1|2|0|ios, iphone, uitableview, swift|0.4915007609
27113686|2|2877|4|2|0|swift, label, null|0.4894271214
32939027|-2|28|0|6|1|ios, swift, uitableview|0.4894271214
28400600|2|61|2|1|0|ios, osx, swift|0.4882837077
28595756|-1|175|1|4|0|ios, swift|0.4882837077
26262330|1|40|1|1|0|ios, swift|0.4876139578
26692837|1|102|3|1|0|swift, optional|0.4876139578
29717210|16|1065|4|2|10|ios, swift, optional, swift2|0.4868629941
31059081|0|48|2|8|0|ios, swift|0.4868629941
26429415|0|98|1|1|0|ios, parsing, swift, facebook-ios-sdk|0.4850501847
32850021|-1|23|1|2|0|string, swift, optional, conditional-binding|0.4850501847
32154698|2|45|1|3|0|swift|0.4827280158
32232392|1|68|3|8|0|swift, generics, swift2|0.4827280158
25192239|0|319|1|1|1|ios, swift|0.4822366347
24998743|-1|528|1|2|0|ios, arrays, swift|0.4818533418
26347777|6|4417|4|0|3|string, swift|0.481148038
25195133|0|186|2|6|0|ios, swift|0.4808378021
26941529|12|2157|1|0|2|swift|0.4802145756
32665811|0|12|1|4|0|ios, swift, sprite-kit|0.4792228981
30298477|0|65|1|0|0|json, swift|0.4779440527
31360764|0|31|0|0|0|swift, null, physics, collision|0.4779440527
30814927|2|127|1|0|0|ios, swift, cllocationmanager|0.4759043271
28679936|0|64|0|2|0|xcode, swift|0.4748477784
29934931|0|198|1|0|0|ios, swift, debugging|0.4741828178
29725263|0|84|0|1|0|swift, core-data, entity|0.473932937
31231766|0|256|1|6|0|ios, swift, uitableview, xib, custom-cell|0.473932937
24190340|8|2561|3|4|1|swift|0.4707402088
25589605|7|1678|4|3|5|swift|0.4707402088
28380119|0|54|1|1|0|objective-c, swift, optional|0.4707402088
32847817|0|43|1|1|1|xcode, swift, swift2, ios9, xcode7|0.4707402088
33056485|0|12|1|1|0|swift, nsdate, nsdateformatter|0.4707402088
32820708|0|23|1|0|0|ios, nsdata, swift2|0.4706779449
24004443|7|2664|2|0|2|swift|0.4699538279
25530976|0|397|1|7|0|swift, uilabel, optional|0.4699538279
25661158|0|58|2|2|0|uitableview, swift|0.4694947685
28407942|0|1757|5|0|0|ios, oop, swift, nsobject|0.4694947685
30323710|1|36|1|0|0|swift, forced-unwrapping, optional-chaining|0.4675497194
28226772|0|73|1|4|1|ios, swift|0.4666605131
28253891|0|52|4|1|0|swift, ios8|0.4666562186
31060347|0|70|2|1|0|ios, swift, hmac, sha256|0.4657212014
24205768|4|1685|2|4|0|ios, osx, cocoa, swift|0.4650291793
30798114|0|74|2|1|0|ios, swift, watchkit|0.4650291793
31871554|2|32|1|5|0|swift|0.4650291793
32371299|-2|56|1|2|0|swift|0.4650291793
32539646|-1|33|2|0|0|ios, swift, uiview, apple|0.4650291793
31743537|-2|68|1|0|0|ios, xcode, swift, optional, optional-variables|0.4638545385
24452562|4|149|4|1|0|swift, optional|0.4636743108
27575753|3|849|4|0|1|swift, optional-variables|0.4636743108
32627096|0|61|1|2|0|sprite-kit, swift2, ios9, optional, skemitternode|0.4630771086
29181871|0|171|2|3|0|debugging, swift|0.4625252687
27992323|1|82|3|4|0|swift, optional|0.4614174115
32015032|-2|67|2|3|0|ios, swift, option|0.4614174115
27235074|0|228|1|1|0|ios, xcode, swift|0.4612472277
26109669|2|401|2|0|1|ios, swift|0.4601005343
31467510|5|183|2|0|1|ios, swift, optional-values|0.4601005343
28765260|1|1341|1|3|0|php, xcode, swift, nsurl, null|0.4576061768
26203000|1|847|2|2|0|ios, swift|0.4572999361
25846561|6|4769|5|0|1|swift|0.4565480798
30657224|3|62|3|0|0|swift, setter, getter, optional|0.4565480798
28420232|1|559|6|0|1|ios, swift, xcode6, optional|0.4565327397
24037827|0|73|1|0|0|swift|0.4554035302
27355107|1|246|1|0|0|ios, swift, uitextfield|0.454076503
29668286|4|84|3|2|0|ios, iphone, ipad, swift, ios8|0.454076503
31089501|0|30|1|1|0|swift|0.454076503
25708909|0|375|1|4|0|uitableview, swift, parse.com, ibaction|0.4537435597
27170979|1|984|1|0|0|swift, nsnumber, optional|0.4529594549
29222971|-2|169|1|3|0|ios, swift, nsdata, null, nsinputstream|0.4529594549
27991378|7|616|2|2|1|ios, swift, optional|0.4505520367
30741155|1|47|2|6|0|ios, swift, coding-style|0.4503266561
29387444|0|665|1|0|0|swift, nslog, optional|0.4502319554
31974094|1|72|2|3|0|swift|0.4502319554
29719373|1|86|1|3|0|ios, uitableview, swift|0.450179823
27381728|0|24|0|4|0|ios, swift, ios8.1|0.4490343613
27622871|21|2677|2|3|9|ios, osx, swift, optional|0.4488312214
24391990|2|109|1|0|0|swift|0.4487460552
29658033|1|86|1|0|1|ios, swift, uiscrollview|0.4487460552
29981505|3|107|1|0|0|ios, swift|0.4482123148
31169465|3|51|1|2|0|ios, swift|0.4482123148
30168668|0|85|1|0|0|swift, resultset, fmdb|0.4472423908
25521886|1|8139|3|3|0|ios, swift, optional-variables|0.4471686969
32078628|0|34|1|13|0|ios, swift|0.4471686969
25540208|2|1873|3|2|1|swift|0.4468874688
29691994|0|54|1|3|0|ios, swift|0.4468874688
29380972|1|78|2|0|1|ios, xcode, swift|0.4454911682
27979618|0|101|2|0|0|ios, web-services, swift, nsurl|0.4437036142
32473931|1|35|1|0|1|swift, optional|0.4437036142
26391158|1|925|1|0|2|ios, swift|0.4433934059
29313022|0|34|0|12|0|ios, swift|0.4433934059
26491089|1|355|1|12|0|ios, xcode, swift, xcode6|0.4417948437
29214748|0|514|1|5|0|ios, swift, button, uicollectionview, cell|0.4417948437
29223886|0|73|1|0|1|swift|0.4417948437
27488351|0|155|1|4|0|ios, uitableview, swift|0.4415687403
30406433|2|115|1|4|0|swift, optional|0.4406312371
25226523|0|387|1|0|0|swift, parse.com|0.4397520938
31708059|0|33|1|0|0|swift|0.4397520938
31814145|1|65|1|4|0|ios, objective-c, iphone, swift, core-audio|0.4397520938
25155695|7|3489|1|2|2|swift|0.437585675
30691942|0|66|3|0|0|ios, swift|0.437585675
27336953|0|57|1|1|0|swift, parse.com, xcode6, pfobject|0.4375607455
27917056|-1|1926|3|3|0|ios, swift, null|0.4375607455
32842255|1|73|2|1|0|ios, swift, swift2, optional, optional-variables|0.4375607455
33022202|0|14|1|1|0|swift, delegates, share, optional|0.4361219128
30807867|2|72|1|0|0|ios, swift|0.4357364841
29250923|1|323|2|0|0|ios, iphone, swift|0.4345277321
32725428|-1|31|1|3|0|ios, swift|0.4342107476
24061039|3|1893|2|0|4|swift, forced-unwrapping|0.4338177997
29143855|0|62|1|9|0|swift, crash, release|0.4326623065
31563630|1|31|1|0|0|swift, admob, fatal-error|0.4326623065
28171075|1|130|4|4|0|swift, if-statement, optional|0.4317810189
29932361|12|249|3|2|2|ios, swift, optional|0.4304499717
32445359|1|51|1|5|0|ios, string, swift|0.4304499717
29903593|0|56|1|4|0|xcode, swift, ads|0.4299131034
28810945|1|107|2|2|0|ios, swift|0.4296148922
29829218|0|162|1|3|0|ios, xcode, swift, nsfilemanager|0.4275428187
## List of Error Handling questions analyzed
To select the questions related to optionals, we ran this query:
```sql
SELECT
q.id_question,
q.score,
q.viewCount,
q.answerCount,
q.commentCount,
q.favoriteCount,
q.tags,
q.id_selected_answer
FROM questions q
WHERE (
(q.processedBody like '% NSError %') or
( q.titleText like '% NSError %') or
(q.processedBody like '% except %' and q.processedBody like '% handl %' ) or
(q.processedBody like '% error %' and q.processedBody like '% handl %' ) or
( q.titleText like '%except%' and q.titleText like '%handl%') or
( q.titleText like '%error%' and q.titleText like '%handl%') or
(q.processedBody like '%catch%' and q.processedBody like '%try%') or
((q.processedBody like '%catch%' or q.processedBody like '%try%') and (q.bodyText like '%finally%') )or
((q.processedBody like '%catch%' or q.processedBody like '%try%') and (q.bodyText like '%defer%') )or
(q.processedBody like '%catch%' and q.processedBody like '%try%' and q.processedBody like '%throw%'));
```
The complete list of questions, with their categories, is available [here](list-error-handling-questions.csv). Below we reproduce with quantitative data.
question|score|views|answers|comments|favorites|tags|id_selected_answer
--------|-----|-----|-------|--------|---------|----|------------------
24004826|6|670|2|1|3|swift|24318062
24010569|129|48915|14|5|37|swift|24030038
24023112|20|30334|2|5|8|exception,try-catch,swift|24023248
24034521|0|992|1|0|1|iphone,ipad,ios7,swift|24075101
24077179|5|1267|2|0|3|ios,swift|24195867
24080991|1|908|1|2|1|objective-c,swift|24086768
24084701|40|12015|2|0|4|swift|24084786
24105571|0|110|2|3|1|swift|24106065
24106275|4|113|1|0|0|swift,instance-methods|24106578
24153613|4|3892|1|6|1|xcode,swift|24153916
24176383|34|22933|4|0|2|swift,xcode6,nserror|24176436
24185549|2|407|5|0|1|cocoa,error-handling,programming-languages,swift,optional|-
24195422|0|2517|1|7|1|ios,sprite-kit,swift|24197404
24207890|6|645|2|2|0|swift|24208144
24250363|1|268|2|2|1|swift|-
24269395|4|928|3|0|2|exception-handling,swift,nsdecimalnumber|24271765
24289289|0|239|2|2|0|initialization,sprite-kit,swift,subclassing|24289621
24297344|2|958|0|2|1|ios,uitableview,swift|-
24297430|5|5219|3|1|1|ios,objective-c,closures,block,swift|24297502
24329394|4|1177|1|5|0|swift,core-motion,nserror|24333158
24332862|0|211|1|0|0|ios,json,swift|24336340
24354769|6|940|2|1|1|swift,protocols|24355052
24393787|2|681|1|3|1|generics,swift|24397161
24427696|1|450|2|1|0|video,swift,avfoundation,ios8|-
24478087|1|1269|1|3|0|swift,nsdata|-
24495878|1|212|0|2|0|swift|-
24509621|7|1215|1|0|2|swift,ios8,nserror,didfailwitherror|24509912
24541924|0|652|1|0|0|ios,swift|24542371
24548837|4|4952|2|1|2|xcode,swift,xcode6|24548953
24562751|1|114|3|9|0|ios,swift|-
24637102|1|778|2|0|0|ios,json,swift|24643574
24710424|5|513|1|5|1|ios,cocoa-touch,exception-handling,swift,nsexpression|32428559
24751513|4|16757|4|10|1|uitableview,swift,ios8|24752512
24868120|2|18301|2|2|2|xcode,swift,global,flags,viewdidload|24868453
24869148|0|321|3|5|1|ios,objective-c,error-handling,swift|24869179
24880744|2|142|1|0|0|multidimensional-array,swift,protocols,subclassing,downcast|31667557
24973119|0|1508|1|0|3|swift,afnetworking-2|-
25080661|2|1383|2|0|1|ios,xcode,swift,xcode6|25080834
25100836|0|127|1|3|0|json,swift,malformed|25101617
25171680|2|1428|2|2|0|ios,frameworks,swift,libxml2,kissxml|25333112
25191877|0|374|2|0|1|swift|25192026
25220698|3|728|3|1|0|objective-c,arrays,swift,subclass,implicit-conversion|-
25276298|1|76|1|1|0|string,swift|25276390
25282349|1|777|1|3|0|swift,nserror|25282670
25308272|1|120|0|5|0|ios,uiviewcontroller,swift,storyboard,segue|-
25311098|15|4869|2|0|4|arrays,struct,swift,nscoding,optional|25344099
25315702|3|180|1|4|0|parsing,exception,recursion,swift|-
25394749|1|654|1|0|0|swift|-
25419983|0|1588|1|1|0|swift,uitextview,override,method-overriding|25420645
25441302|5|1342|2|0|2|ios,swift,error-handling|25442521
25491220|0|303|1|2|0|unit-testing,swift,cloudkit|-
25578114|0|843|3|3|0|xcode,swift,interface-builder,xcode6,uicontrol|-
25651819|4|6200|2|1|1|ios,swift,nsurlconnection,nsurl,nsurlconnectiondelegate|25652087
25670948|0|142|0|8|0|ios,iphone,ios7,swift,ios8|-
25673414|1|653|0|3|0|ios,xcode,swift,restkit|-
25693017|2|939|1|0|0|ios,swift,nserror,unsafe-pointers|25693196
25707268|0|64|1|0|0|xcode,swift,xcode6|25707541
25711010|0|296|1|0|0|ios,csv,swift|25711189
25817565|2|786|1|2|1|ios,swift,cloudkit,promisekit|27286646
25836247|2|574|2|3|0|ios,swift,ios8,optional-parameters,foundation|25837053
25860169|6|441|1|2|1|ios,error-handling,swift|27576760
25919551|2|964|2|0|0|ios,objective-c,xcode,swift|26348109
25963945|1|428|2|1|0|function,generics,swift|25965583
25968368|4|1422|2|3|0|swift,initialization,nsdata,xcode6|-
26037657|1|1027|2|10|0|ipad,swift,uiactionsheet|-
26038258|4|1237|2|1|0|swift|26065243
26056062|3|1408|2|6|2|ios,objective-c,iphone,uiviewcontroller,swift|26114926
26087438|-1|43|1|0|0|ios,swift,parse.com|-
26129459|0|423|1|0|0|swift,uirefreshcontrol|26129905
26130657|1|294|0|0|0|swift,social,slcomposeviewcontroller|-
26142111|0|218|1|2|0|core-data,swift,optional-parameters,class-variables|-
26177150|0|335|0|2|0|ios,json,xcode,swift,alamofire|-
26211020|2|89|1|0|0|objective-c,unit-testing,swift,tdd,xctest|-
26239591|0|483|1|0|0|ios,swift,syntax-error,completionhandler|26239635
26249643|1|232|3|0|0|swift,uibutton,ios8,exc-bad-instruction|26250548
26304985|4|397|5|0|1|swift,error-handling,optional|26306960
26309793|7|2569|3|4|2|ios,ipad,swift,uidocumentinteraction,quicklook|30825832
26317514|1|1611|1|0|0|swift|-
26374127|2|135|0|4|0|ios,swift,nsdata,nsexception,nskeyedunarchiver|-
26378271|1|386|1|0|0|swift,size-classes|-
26391853|0|153|0|0|0|objective-c,swift,error-handling,nserror|-
26411894|2|250|2|4|1|swift|-
26452427|3|422|1|0|2|ios,generics,swift|26452628
26462610|0|157|1|0|0|ios,swift,initialization,xcode6.1-gm-seed|-
26500829|0|371|2|3|0|ios,iphone,swift,xcode6|26500921
26545444|4|647|1|0|2|exception,swift,runtime,signals,handle|-
26551625|2|741|0|7|0|ios,ios7,swift,xcode6|-
26633496|0|424|2|0|0|ios,swift,closures|26633624
26656696|0|1760|1|1|0|ios,iphone,xcode,swift|26658236
26686982|7|320|2|0|0|swift,enums|-
26754481|8|7397|3|0|2|ios,json,swift,xcode6|-
26811613|1|561|1|0|0|ios,swift,nserror|-
26812557|0|332|2|0|1|ios,xcode,osx,swift|26831964
26819116|0|2041|3|3|0|ios,uitableview,swift,uiviewcontroller|-
26824155|0|200|1|1|0|ios,core-data,swift,dealloc,svgkit|26825967
26830211|2|900|0|3|0|ios,cocoa,swift,nsurlsession|-
26832043|0|93|1|1|0|ios,xcode,swift,gamekit|-
26840513|0|306|2|0|0|osx,swift,nsurl|26861815
26852238|-5|285|1|3|0|ios,xcode,swift,uiviewcontroller,fatal-error|26852801
26904386|0|189|0|5|0|swift,sprite-kit,game-center|-
27010208|3|321|1|0|0|xcode,swift,ios8,optional,abrecord|-
27067495|2|1492|2|9|2|ios,multithreading,core-data,swift,nsfetchedresultscontrolle|27116344
27071232|0|54|1|4|0|ios,core-data,swift|-
27080906|0|203|0|0|0|swift,key-value-observing,nscoding|-
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