Write smarter code with Sealed Classes and Lambdas in Kotlin
summary
Kotlin example builds a RecyclerView with a sealed StaggeredListItem hierarchy (BuyNow, Auction, Advertisement) attached to data classes so each case carries its own fields and benefits from smart casted properties without explicit casts. A generic BaseViewHolder<T: StaggeredListItem> plus an enum-backed getItemViewType keeps creation simple; lambdas replace bulky callback interfaces so clicks are passed as functions and composed at adapter construction. Compiler enforces exhaustive when branches and benchmarks show negligible lambda overhead.
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chapters (8)
- 0:00Introduction
- 1:36About the speaker
- 3:20Sealed classes basics
- 9:20Lambda expressions overview
- 13:55Combining sealed classes and lambdas
- 21:43Building a text store demo
- 26:03Handling new item types
- 29:14Q&A session
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