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dart-use-pattern-matching

Applies Dart 3 pattern matching, switch expressions, and destructuring idiomatically to validate data schemas, handle algebraic data types, and decompose control flow. Use when refactoring complex if-else chains, parsing polymorphic JSON or API responses, destructuring Lists, URI/path segments, String.split() tokens, Records, or Maps, or enforcing exhaustiveness on sealed classes. Don't use for simple boolean conditions, single-variable type promotion (use `is`), or basic collection filtering.

skills/dart-use-pattern-matching/SKILL.md

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Nov 5, 2026
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# Implementing Dart Patterns

## Contents
- [Pattern Selection Strategy](#pattern-selection-strategy)
- [Switch Statements vs. Expressions](#switch-statements-vs-expressions)
- [Core Pattern Implementations](#core-pattern-implementations)
- [Pragmatic Balance & Anti-Patterns](#pragmatic-balance--anti-patterns)
- [Workflows](#workflows)
- [Examples](#examples)

## Pattern Selection Strategy

Apply specific pattern types based on the data structure and desired outcome. Follow these conditional guidelines:

*   **If validating and extracting from deserialized data (e.g., JSON):** Use Map, List, and Object patterns to validate schema structure and destructure properties in a single step.