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kotlin-control-flow

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Use when writing or reviewing Kotlin branching and control flow: when expressions, guard conditions, sealed type exhaustiveness, smart casts, nullable branching, early returns, or replacing complex if/else chains.

skills/kotlin-control-flow/SKILL.md

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# Kotlin control flow

## Core principle

Make the classified value obvious, keep branch-local predicates on their
branch, and let the compiler prove closed-domain coverage.

## Procedure

1. Name the value being classified. If every branch tests it, use
   `when (subject)`; otherwise keep a subjectless `when` or `if` chain.
2. Choose the branch shape:

   | Code shape | Prefer |
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