Kotlin best practices

Skill ComeOnOliver/skillshub/skills/HoangNguyen0403/agent-skills-standard/kotlin-best-practices

Core patterns for robust Kotlin code including scope functions and backing properties. Use when writing idiomatic Kotlin, choosing between scope functions (let/apply/run/also/with), encapsulating mutable state with backing properties, or exposing read-only collection interfaces. (triggers: **/*.kt, apply, let, run, also, with, runCatching, backing property, MutableList, internal, private set)From its SKILL.md

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SKILL.md

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Kotlin Best Practices

Priority: P1 (HIGH)

Engineering standards for clean, maintainable Kotlin systems.

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 an 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.

References

Backing Property & Scope Function Examples

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