skills/ HoangNguyen0403/agent-skills-standard

kotlin-best-practices

Core Kotlin patterns for scope functions, backing properties, and read-only collection interfaces. Use for let/apply/run/also/with choices or encapsulating mutable state; defer general language constructs, extension functions, coroutines/runCatching, Android/Room recipes, and testing/tooling setup.

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Kotlin Best Practices

Priority: P1 (HIGH)

Implementation Guidelines

  • Scope Functions:
  • apply: Object configuration (returns object).
  • also: Side effects / validation / logging (returns object).
  • let: Null checks (?.let) or mapping (returns result).
  • run: Object configuration and mapping (returns result).
  • with: Grouping multiple method calls on object (returns result).
  • Backing Properties: Use _state (private mutable, e.g., private val _state = MutableStateFlow(initial)) exposed as val state = _state.asStateFlow() (public read-only). Pattern: _prop private, prop public.
  • Collections: Expose List/Map (read-only) publicly; keep MutableList internal.
  • Error Handling: Use runCatching for simple error handling over try/catch blocks.
  • Visibility: Default to private or internal. Minimize public surface area.
  • Top-Level: Prefer top-level functions/constants over implementation-less object singletons.

Anti-Patterns

  • No Deep Scope Nesting: Limit let/apply nesting to 2 levels; deeper destroys readability.
  • No Public var: Use private set or backing properties for encapsulation.
  • No Global Mutable State: Avoid mutable top-level variables.

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