--- title: 5 Kotlin Features Every Android Developer Should... description: A deep dive into five intermediate-to-advanced Kotlin features for Android developers: Delegated Properties for reacting to state changes without boilerplate... canonical: https://daily.dev/posts/5-kotlin-features-every-android-developer-should-actually-be-using-part-2-z5lxjn1d1 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: 5 Kotlin Features Every Android Developer Should Actually Be Using part 2 | daily.dev og:description: A deep dive into five intermediate-to-advanced Kotlin features for Android developers: Delegated Properties for reacting to state changes without boilerplate... og:url: https://daily.dev/posts/5-kotlin-features-every-android-developer-should-actually-be-using-part-2-z5lxjn1d1 og:image: https://api.daily.dev/og/posts/Z5lxJN1D1.png og:image:alt: 5 Kotlin Features Every Android Developer Should Actually Be Using part 2 og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # 5 Kotlin Features Every Android Developer Should Actually Be Using part 2 **[Medium](https://daily.dev/sources/medium_js)** · 9 min read · 0 upvotes · 0 comments ## Summary A deep dive into five intermediate-to-advanced Kotlin features for Android developers: Delegated Properties for reacting to state changes without boilerplate setters, Kotlin Contracts for extending smart-cast null-safety through custom helper functions, Sequences for lazy evaluation to avoid intermediate list allocations on large collections, crossinline and noinline modifiers for fine-grained control over inline lambda behavior, and functional (SAM) interfaces to replace verbose anonymous object expressions with plain lambdas. Each feature is explained with practical code examples and trade-offs. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Hidden KOTLIN: 9 Language Features Even Senior Devs Miss in Code Review](https://daily.dev/posts/hidden-kotlin-9-language-features-even-senior-devs-miss-in-code-review-wbqb9cwtu) · Medium · 1 upvotes · 0 comments - [Kotlin Weekly \#525](https://daily.dev/posts/kotlin-weekly-525-nmuqgilxs) · Kotlin Weekly · 1 upvotes · 0 comments - [Kotlin DSL Deep Dive: From Gradle Scripts to Building Your Own](https://daily.dev/posts/kotlin-dsl-deep-dive-from-gradle-scripts-to-building-your-own-qsm30digc) · ProAndroidDev · 0 upvotes · 0 comments - [How Mobile Development Teams Use Kotlin in 2025: Insights From a Certified Trainer](https://daily.dev/posts/how-mobile-development-teams-use-kotlin-in-2025-insights-from-a-certified-trainer-oqpsbvuud) · JetBrains · 0 upvotes · 0 comments - [Learn Modern Kotlin](https://daily.dev/posts/learn-modern-kotlin-emjhfvz0q) · freeCodeCamp · 2 upvotes · 0 comments --- Tags: [#android](https://daily.dev/tags/android), [#kotlin](https://daily.dev/tags/kotlin) [View this post on daily.dev](https://daily.dev/posts/5-kotlin-features-every-android-developer-should-actually-be-using-part-2-z5lxjn1d1) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"5 Kotlin Features Every Android Developer Should Actually Be Using part 2","url":"https://daily.dev/posts/5-kotlin-features-every-android-developer-should-actually-be-using-part-2-z5lxjn1d1","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/5-kotlin-features-every-android-developer-should-actually-be-using-part-2-z5lxjn1d1"},"datePublished":"2026-07-25T19:32:46.015Z","dateModified":"2026-07-25T19:36:02.466Z","description":"A deep dive into five intermediate-to-advanced Kotlin features for Android developers: Delegated Properties for reacting to state changes without boilerplate...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/6efd2f121e58bb8b52e1ca75e1d29206?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/6efd2f121e58bb8b52e1ca75e1d29206?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"Medium","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Medium","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/medium","url":"https://daily.dev/sources/medium_js"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/5-kotlin-features-every-android-developer-should-actually-be-using-part-2-z5lxjn1d1","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"android,kotlin","timeRequired":"PT9M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Medium","item":"https://daily.dev/sources/medium_js"},{"@type":"ListItem","position":3,"name":"5 Kotlin Features Every Android Developer Should Actually Be Using part 2"}]} ```