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40 lines
1016 B
Markdown
40 lines
1016 B
Markdown
---
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description: "Kotlin coding style extending common rules"
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globs: ["**/*.kt", "**/*.kts", "**/build.gradle.kts"]
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alwaysApply: false
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---
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# Kotlin Coding Style
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> This file extends the common coding style rule with Kotlin-specific content.
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## Formatting
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- Auto-formatting via **ktfmt** or **ktlint** (configured in `kotlin-hooks.md`)
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- Use trailing commas in multiline declarations
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## Immutability
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The global immutability requirement is enforced in the common coding style rule.
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For Kotlin specifically:
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- Prefer `val` over `var`
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- Use immutable collection types (`List`, `Map`, `Set`)
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- Use `data class` with `copy()` for immutable updates
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## Null Safety
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- Avoid `!!` -- use `?.`, `?:`, `require`, or `checkNotNull`
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- Handle platform types explicitly at Java interop boundaries
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## Expression Bodies
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Prefer expression bodies for single-expression functions:
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```kotlin
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fun isAdult(age: Int): Boolean = age >= 18
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```
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## Reference
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See skill: `kotlin-patterns` for comprehensive Kotlin idioms and patterns.
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