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pcoulbournepcoulbourne/everything-claude-code/.cursor/rules/kotlin-coding-style.md

everything-claude-code / rules

Cursor rule1 starsChanged 7 months agoMITView on GitHub

Kotlin coding style extending common rules

17 other projects use a version of this.

Adopted by

Steady: 0 new projects took it in the last 4 weeks, none the 4 weeks before.thin data

Week of Sep 13: 0 new projectsWeek of Sep 20: 0 new projectsWeek of Sep 27: 0 new projectsWeek of Oct 4: 0 new projectsWeek of Oct 11: 0 new projectsWeek of Oct 18: 0 new projectsWeek of Oct 25: 0 new projectsWeek of Nov 1: 0 new projects
Sep 2026Oct 2026Nov 2026
New projects taking a version of this file each week, over the 8 weeks our latest run read: only 0 in all, so this is a hint, not a trend.

Most recently taken up by

The file

We split this kotlin-coding-style.md into the rules it gives an agent

6 rules. About 0 are common, 2 are distinctive, and 4 are very specific to this project.

  • ≈0

    Common · estimate

    Many files like this have a rule of this kind.

  • ≈2

    Distinctive · estimate

    This author's own choices. Worth a look.

  • 4

    Very specific

    Tied to their project's names, files or tools. Probably skip.

  • Common
  • Distinctive
  • Very specific
  1. Distinctive:

    Use trailing commas in multiline declarations

    line 13
  2. Very specific:

    Prefer val over var

    line 20
  3. Very specific:

    Use immutable collection types (List, Map, Set)

    line 21
  4. Very specific:

    Use data class with copy() for immutable updates

    line 22
  5. Very specific:

    Avoid !! -- use ?., ?:, require, or checkNotNull

    line 26
  6. Distinctive:

    Prefer expression bodies for single-expression functions:

    line 31

≈ “Common” is an estimate: at least 1 in 5 of the 6,668 Cursor rule files we read have a rule of the same kind, not the same words. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.
Files
kotlin-coding-style.md

Kotlin Coding Style

This file extends the common coding style rule with Kotlin-specific content.

Formatting

  • Auto-formatting via ktfmt or ktlint (configured in kotlin-hooks.md)
  • Use trailing commas in multiline declarations

Immutability

The global immutability requirement is enforced in the common coding style rule. For Kotlin specifically:

  • Prefer val over var
  • Use immutable collection types (List, Map, Set)
  • Use data class with copy() for immutable updates

Null Safety

  • Avoid !! -- use ?., ?:, require, or checkNotNull
  • Handle platform types explicitly at Java interop boundaries

Expression Bodies

Prefer expression bodies for single-expression functions:

fun isAdult(age: Int): Boolean = age >= 18

Reference

See skill: kotlin-patterns for comprehensive Kotlin idioms and patterns.

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