알아두면 쓸 데 있는 코틀린

߅ਊӂ ঌইفݶ ॶؘ੓ח ௏ౣܽ

https://www.southernliving.com/culture/difference-between-road-street-avenue-boulevard ੉ঠӥѢܻ ۄڍח݈੉ঠ ૑धನ౟ಫܻয় ঌইفݶॶؘ੓ח௏ౣܽ ௏ౣܽਸ੊൤ח࢖ױ҅

߅ਊӂ.apply { ࣗࣘ = "׼Ӕ݃௄ / झ೐݂۞ց" ౠ૚ = "݈
݆਺, nߓࣘ ੤ࢤ" }

https://www.inven.co.kr/board/lostark/4811/2938402

https://blog.outsider.ne.kr/456

https://www.callicoder.com/java-lambda-expression-tutorial/

https://www.ebay.co.uk/itm/235001704718

https://webkul.com/ios-app-development/ https://developer.apple.com/tutorials/swiftui

૑ध ನ౟ಫܻয়ী ઱ӝ੸ਵ۽ ై੗ೞۄ

*5࢑স਷Ր੐হ੉߸ചೞחౠࢿਸо૑ݴ য়טഝਊغחӝࣿ੉ղੌ਷ࢎਊغ૑ঋ ਸࣻ੓Ҋ ߈؀۽੉੹ীח઱ݾ߉૑ঋ؍ӝࣿ੉઺ਃ೧૕ࣻ੓णפ׮׮নೠӝࣿী ੊ࣼ೧૑ݶ੉۞ೠ߸ചীਬোೞѱ؀਽ೡࣻ੓णפ׮ژೠ ׮নೠ૑धҗמ۱਷ѐ ੋ੄੹ޙࢿਸ࢚थदఃݴ ࢜۽਍૒সӝഥܳ঳חؘীب௾ب਑੉ؾפ׮ بࢲ पਊ઱੄೐۽Ӓېݠীࢲਃডߊ஀

ݒ֙࢜۽਍঱যܳ୭ࣗೞաחߓਕۄ https://www.studyandgoabroad.com/meaningful-travel/language-travel/long-does-learn-foreign-language/

׮নೠҙ੼җޙઁ೧Ѿߑध http://www.iscicommunications.com/each-persons-truth-depends-on-their-perspective/

߸ചػജ҃ী੸਽ೡࣻ੓חמ۱ https://www.goodwin.edu/enews/seven-qualities-of-adaptable-people/

https://flic.kr/p/2mv5Gg5 ೙ਃীٮۄԁղॳחبҳ࢚੗

ӝഥоয়ݶ੟חמ۱ https://flic.kr/p/2mv5Gg5

೐۽؋౟ূ૑פযܳೱೠߊѦ਺ https://www.classicinformatics.com/blog/how-to-hire-full-stack-developer

Ӓېࢲ ަ ߓ਋ۄҊ https://www.focusonthefamily.com/parenting/how-to-cope-with-an-angry-baby-or-toddler/

https://survey.stackoverflow.co/2023/ .PTU QPQVMBS UFDIOPMPHJFT

https://programmers.co.kr/pages/2023-dev-survey о੢ ߓ਋Ҋर਷ ೐۽Ӓې߁঱য https://programmers.co.kr/pages/2023-dev-survey

KotlinConf 23 Keynote Kotlin Handy to Know ,PUMJO$POGs,FZOPUF Github projects
use Kotlin as their primary language Increase in Multiplatform libraries in 2002 of Android users are satisfied with Kotlin of the top 1,000 Android apps use Jetpack Compose of all kotlin users are satisfied with Kotlin of the top 1,000 Android apps are in Kotlin 1M 86 95 60 97 23 of the all daangn projects use Multiplatform 1 of the all daangn projects use Kotlin 10

https://blog.kotzilla.io/koin-kotlinconf-2023/ ঌইفݶ ॶؘ੓ח ௏ౣܽ

] ҍ׮۝੄௏٘о୹ށ೤פ׮

] ௏ౣܽ੄୍೟ ,PUMJOJO"DUJPO %NJUSZ+FNFSPWBOE4WFUMBOB*TBLPWB https://www.manning.com/books/kotlin-in-action ௏ౣܽ਷੗߄৬੄࢚ഐ਍ਊࢿীୡ੼ਸݏ୸पਊ੸੉ҊрѾೞݴ উ੹ೠ঱য੉׮

KotlinConf 23 Keynote Kotlin Handy to Know ௏ౣܽ਷੗߄৬੄࢚ഐ਍ਊࢿীୡ੼ਸݏ୸पਊ੸੉ҊрѾೞݴউ੹ೠ঱য੉׮ /* ೐۽ಌ౭ী
؀ೠ getter(), setter(), equals(), hashCode(), toString(), * copy(), componentN() ݫࣗ٘ܳ ஹ౵ੌ द੼ী ੗زਵ۽ ࢤࢿೠ׮ */ data class Person(val firstname: String, val lastname: String, val address: Address) // ಴ળ ۄ੉࠳۞ܻ੄ ೂࠗೠ API৬ Ҋର ೣࣻ੄ ب਑ਸ ߉ই рѾೞѱ ݾ੸ਸ ׳ࢿೡ ࣻ ੓׮ val filteredPersons = Persons.findByLastname("Matthews").filter { it.address.city == "Seoul" } // ױੌ಴അ ೣࣻח ١ഐ۽ ೣࣻ ੿੄৬ ߄٣ܳ ҳ࠙ೞৈ ૣѱ ಴അೡ ࣻ ੓׮ fun double(x: Int): Int = x * 2 val beDoubled = double(2) // օnull੉ ؼ ࣻ হח чਸ ୶੸ೞݴ, NullPointException ߊࢤਸ ߑ૑ೠ׮ val nullable: String? = null // օ੉ ؼ ࣻ ੓਺ val nonNullable: String = "" // օ੉ ؼ ࣻ হ਺ // ఋੑ Ѩࢎ৬ நझ౟о ೠ ো࢑੗ী ੄೧ ੉ܞ૑ݴ, ClassCastException ߊࢤਸ ߑ૑ೠ׮ val data = loadData() if (data is String) { data.uppercase(Locale.getDefault()) } // break ޙ੉ হযب غݴ, ৌѢഋ э਷ ౠ߹ೠ ఋੑҗ ೣԋ ॳݶ ݽٚ ч੉ ಣоغ঻ח૑ ഛੋೠ׮ val scoreRange = when(CreditScore.EXCELLENT) { CreditScore.BAD -> 300..629 CreditScore.FAIR -> 630..689 CreditScore.GOOD -> 690..850 } enum class CreditScore { BAD,FAIR,GOOD } Kotlin Showcase

] ௏ܖ౯ https://www.xenonstack.com/insights/coroutines

KotlinConf 23 Keynote Kotlin Handy to Know ࠺زӝ೐۽Ӓې߁ਸਤೠ௏ܖ౯ // GitHub
API۽ ࢎਊ੗, ઑ૒, ੷੢ࣗ ؘ੉ఠܳ ஂٙೞӝ ਤೠ ஹನք౟੉׮ class GitHubOperations(val accessToken: String) { suspend fun fetchUser(username: String): User {..} suspend fun fetchOrganizations(user: User): List<Organization> {..} suspend fun fetchRepositories(user: User): List<Repository> {..} } Kotlin Showcase // GitHub ࢎਊ੗੄ ੿ࠁܳ ࠺زӝ੸ਵ۽ оઉয়ח ௏ܖ౯ ೣࣻ੉׮ suspend fun getGithubInfo(username: String, accessToken: String) = coroutineScope { val operations = GitHubOperations(accessToken) // ࢎਊ੗ ੿ࠁܳ оઉৡ׮ val user = operations.fetchUser(username) // ࢎਊ੗о ࣗࣘػ ઑ૒ٜҗ ੷੢ٜࣗਸ زदী ࠺زӝ੸ਵ۽ оઉৡ׮ val organizations = async { operations.fetchOrganizations(user) } val repositories = async { operations.fetchRepositories(user) } // ݽٚ ࠺زӝ ੘স੉ ৮ܐػ റ GithubInfo ё୓ܳ ࢤࢿ೧ࢲ ߈ജೠ׮ GithubInfo(user, organizations.await(), repositories.await()) }

] ݣ౭ಁ۞׮੐ https://magdamiu.com/2022/02/03/high-performance-with-idiomatic-kotlin/

KotlinConf 23 Keynote Kotlin Handy to Know ݣ౭ಁ۞׮੐ // GitHub
API۽ ࢎਊ੗, ઑ૒, ੷੢ࣗ ؘ੉ఠܳ ஂٙೞӝ ਤೠ ੋఠಕ੉झ৬ ҳഅ୓ٜ੉׮ interface GithubOperations { fun fetchUser(username: String): User fun fetchOrganizations(user: User): List<Organization> fun fetchRepositories(user: User): List<Repository> } class MockGithubOperations : GithubOperations { ... } class KtorGithubOperations(httpClient: HttpClient) : GithubOperations { ... } Kotlin Showcase // Ҋର ೣࣻܳ ࢎਊ೧ࢲ GitHub ੿ࠁܳ ઑ݀೧ࢲ ߈ജೠ׮ fun <T> getGithubInfo( username: String, operations: GithubOperations, assemble: (User, List<Organization>, List<Repository>) -> T): T { val user = operations.fetchUser(username) val organizations = operations.fetchOrganizations(user) val repositories = operations.fetchRepositories(user) return assemble(user, organizations, repositories) } // ೣࣻо ز੘ೞחؘ ೙ਃೠ ੄ઓҙ҅ܳ ੹׳ೞҊ, ۈ׮ܳ ా೧ GitHub ੿ࠁܳ ਗೞח ߑधਵ۽ ઑ൩ೠ׮ getGithubInfo("jumpit", KtorGithubOperations(ktor())) { user, orgs, repos -> // ױࣽೠ ৘: ࢎਊ੗ ੉ܴҗ ઑ૒੄ ࣻ, ୭Ӕ ழ޿੉ ੓ח ੷੢ࣗ੄ ࣻܳ ߈ജ "User: ${user.name}, Orgs: ${orgs.size}, Repos: ${repos.count { it.hasRecentCommit }}" }

] ݣ౭೒ۖಬ https://kotlinlang.org/docs/multiplatform.html

KotlinConf 23 Keynote Kotlin Handy to Know ݣ౭೒ۖಬ // Common
Kotlin: ݽٚ ೒ۖಬী ҕਬغח ௏٘੉׮ interface GithubOperations { fun fetchUser(username: String): User fun fetchOrganizations(user: User): List<Organization> fun fetchRepositories(user: User): List<Repository> } class HttpClientGithubOperations(private val httpClient: HttpClient) : GithubOperations { ... } Kotlin Showcase // Android ೒ۖಬ ҳഅ ௏٘: Okhttp ۽ ز੘ೠ׮ actual class HttpClient(okhttp: OkHttpClient) { ... } // iOS ೒ۖಬ ҳഅ ௏٘: Ktor Client for Native ਵ۽ ز੘ೠ׮ actual class HttpClient(ktor: io.ktor.client.HttpClient) { ... } // JS ೒ۖಬ ҳഅ ௏٘: Ktor Client for JavaScript ۽ ز੘ೠ׮ actual class HttpClient(ktor: io.ktor.client.HttpClient) { ... } // JVM ೒ۖಬ ҳഅ ௏٘: Spring RestTemplate ۽ ز੘ೠ׮ actual class HttpClient(restTemplate: RestTemplate) { ... } // expect৬ actual ಁఢਸ ࢎਊೞݶ ೒ۖಬ ౠ੿ ҳഅਸ ҕਬ ۽૒ীࢲ ܻ࠙ೡ ࣻ ੓׮ // ੉ܳ ా೧ ௏٘ ੤ࢎਊࢿਸ ਬ૑ೞݶࢲ ೒ۖಬ ౠ੿ࢿਸ ࠁઓೡ ࣻ ੓׮ expect class HttpClient { fun exchage(request: Request): Response }

] য়೑ࣗझ https://www.govwebworks.com/2019/10/29/improving-process-with-open-source-technologies/

ழޭפ౭ ӝ߈ ߊ੹

https://lermagazine.com/issues/june/short-breaks-help-the-brain-learn-new-skills ௏ౣܽਸ੊൤ח࢖ױ҅

঄Ҋ https://www.inflearn.com/course/코틀린-끝내기 оߺѱ

ڳҊ https://www.jetbrains.com/ko-kr/academy/ नաѱ

https://www.manning.com/books/kotlin-in-action ݍࠁҊ ԝԝ൤

2" https://www.flickr.com/photos/seandreilinger/2326448445/

ଵҊ੗ܐ ✔ 도서, 실용주의 프로그래머 ✔ 도서, Kotlin in Action
✔ KotlinConf 2023 - Keynote

알아두면 쓸 데 있는 코틀린

알아두면 쓸 데 있는 코틀린

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