dhruvanbhalara
Registry indexed
dart-use-pattern-matching
Use when implementing switch expressions, relational patterns, object destructuring, or exhaustive sealed class handling.
Overview
Use when implementing switch expressions, relational patterns, object destructuring, or exhaustive sealed class handling.
Read full documentation
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Contents
- Pattern Selection Strategy
- Switch Expressions vs Switch Statements
- Core Pattern Syntaxes
- Workflow: Designing Pattern Matching Logic
- Examples
Pattern Selection Strategy
Apply distinct pattern matching strategies based on the target data structure:
- JSON Validation and Destructuring: Use Map and List patterns to simultaneously validate nested shapes and bind values to local variables in a single step.
- Multiple Returns: Return Records from functions and use Record patterns to destructure named or positional values directly into scoped variables.
- Algebraic Data Types (ADTs): Combine
sealedclass hierarchies with Object patterns in switch expressions to benefit from compile-time exhaustiveness checking. - Numeric Ranges and logical Checks: Combine relational patterns (
>=,<, etc.) and logical-and (&&) or logical-or (||) operators within switch cases. - Guard Clauses: Use the
whenkeyword to assert dynamic conditions that cannot be expressed purely through static patterns.
Switch Expressions vs Switch Statements
Choose the correct switch construct based on the operational context:
Switch Expressions
- When to Use: When the switch construct must resolve to and return a single value.
- Syntax:
final result = switch (value) { pattern => expression, _ => fallback }; - Rule: Every case must resolve to an expression (no statements or code blocks). The cases must be exhaustive (checked by the compiler). Implicit fallthrough is not supported.
Switch Statements
- When to Use: When the switch construct must execute side effects, statements, or complex code blocks.
- Syntax:
switch (value) { case pattern: // statements break; // Implicitly breaks, but can be added explicitly } - Rule: Empty cases fall through. Non-empty cases do not implicitly fall through.
Core Pattern Syntaxes
Understand and apply standard Dart 3+ pattern syntaxes:
- Logical-or (
||): Combines patterns. Matches if either pattern succeeds. Both branches must define identical sets of variables. - Logical-and (
&&): Matches if both patterns succeed. Branches must not define overlapping variables. - Relational: Evaluates against constants using comparative operators (e.g.
> 100,!= 0). - Cast (
as): Asserts type transformations during destructuring (throws if type check fails). - Null-check (
?): Filters out null values and binds variables to their non-nullable base types. - Null-assert (
!): Asserts that a value is non-nullable (throws if null). - List Pattern: Matches arrays of specific length (e.g.
[var first, var second]). Use a rest element (...) to ignore trailing list elements. - Map Pattern: Matches key-value targets (e.g.
{'id': var id}). Ignores keys that are not explicitly matched. - Object Pattern: Matches class instances and extracts property values (e.g.
User(:final name)).
Workflow: Designing Pattern Matching Logic
Follow this checklist to implement clean pattern matching structures:
- Determine the structure: Identify if the source is an Enum, a Sealed Class hierarchy, a Record, or raw JSON.
- Select switch structure: Choose Switch Expressions for value assignments, or Switch Statements for side effects.
- Define case bindings: Construct explicit Map, List, or Object patterns to extract needed fields into scoped variables.
- Inject guards: Add
whenexpressions for conditional boundary checks. - Verify exhaustiveness: If using a sealed class or enum, let the compiler enforce exhaustiveness. If using open types, include a wildcard
_fallback. - Validate compiler output: Run
dart analyzeto ensure there are no unhandled cases or type mismatches.
Examples
JSON Validation and Parsing
Validate structure and extract values in a single step using map destructuring.
void processPayload(Map<String, dynamic> payload) {
if (payload case {'status': 'success', 'data': [String title, int count]}) {
print('Product: $title, Inventory: $count');
} else {
print('Invalid payload structure received');
}
}
Exhaustive Sealed Class Matching
Use sealed classes to force exhaustive compile-time verification when executing domain logic.
sealed class NetworkState {}
class NetworkIdle extends NetworkState {}
class NetworkLoading extends NetworkState {}
class NetworkSuccess extends NetworkState {
final String response;
NetworkSuccess(this.response);
}
class NetworkFailure extends NetworkState {
final String error;
NetworkFailure(this.error);
}
// Compiler guarantees all sub-states are handled without requiring a default fallback
String getStatusMessage(NetworkState state) {
return switch (state) {
NetworkIdle() => 'Waiting to connect...',
NetworkLoading() => 'Loading data...',
NetworkSuccess(:final response) => 'Data loaded: $response',
NetworkFailure(:final error) => 'Failed: $error',
};
}
Record Destructuring and Swapping
// Destructuring a positional and named return record:
(String name, {int age}) getUser() => ('Alice', age: 30);
void main() {
final (name, age: userAge) = getUser();
print('$name is $userAge years old');
// Value swapping without temp variables:
var (x, y) = (1, 2);
(y, x) = (x, y);
}
File metadata
name: dart-use-pattern-matching
description: Use when implementing switch expressions, relational patterns, object destructuring, or exhaustive sealed class handling.
metadata:
platforms: "dart"
languages: "dart"
category: "logic"View original text
---
name: dart-use-pattern-matching
description: Use when implementing switch expressions, relational patterns, object destructuring, or exhaustive sealed class handling.
metadata:
platforms: "dart"
languages: "dart"
category: "logic"
---
## Contents
- [Pattern Selection Strategy](#pattern-selection-strategy)
- [Switch Expressions vs Switch Statements](#switch-expressions-vs-switch-statements)
- [Core Pattern Syntaxes](#core-pattern-syntaxes)
- [Workflow: Designing Pattern Matching Logic](#workflow-designing-pattern-matching-logic)
- [Examples](#examples)
## Pattern Selection Strategy
Apply distinct pattern matching strategies based on the target data structure:
- **JSON Validation and Destructuring**: Use Map and List patterns to simultaneously validate nested shapes and bind values to local variables in a single step.
- **Multiple Returns**: Return Records from functions and use Record patterns to destructure named or positional values directly into scoped variables.
- **Algebraic Data Types (ADTs)**: Combine `sealed` class hierarchies with Object patterns in switch expressions to benefit from compile-time exhaustiveness checking.
- **Numeric Ranges and logical Checks**: Combine relational patterns (`>=`, `<`, etc.) and logical-and (`&&`) or logical-or (`||`) operators within switch cases.
- **Guard Clauses**: Use the `when` keyword to assert dynamic conditions that cannot be expressed purely through static patterns.
## Switch Expressions vs Switch Statements
Choose the correct switch construct based on the operational context:
### Switch Expressions
- **When to Use**: When the switch construct must resolve to and return a single value.
- **Syntax**: `final result = switch (value) { pattern => expression, _ => fallback };`
- **Rule**: Every case must resolve to an expression (no statements or code blocks). The cases must be exhaustive (checked by the compiler). Implicit fallthrough is not supported.
### Switch Statements
- **When to Use**: When the switch construct must execute side effects, statements, or complex code blocks.
- **Syntax**:
```dart
switch (value) {
case pattern:
// statements
break; // Implicitly breaks, but can be added explicitly
}
```
- **Rule**: Empty cases fall through. Non-empty cases do not implicitly fall through.
## Core Pattern Syntaxes
Understand and apply standard Dart 3+ pattern syntaxes:
- **Logical-or (`||`)**: Combines patterns. Matches if either pattern succeeds. Both branches must define identical sets of variables.
- **Logical-and (`&&`)**: Matches if both patterns succeed. Branches must not define overlapping variables.
- **Relational**: Evaluates against constants using comparative operators (e.g. `> 100`, `!= 0`).
- **Cast (`as`)**: Asserts type transformations during destructuring (throws if type check fails).
- **Null-check (`?`)**: Filters out null values and binds variables to their non-nullable base types.
- **Null-assert (`!`)**: Asserts that a value is non-nullable (throws if null).
- **List Pattern**: Matches arrays of specific length (e.g. `[var first, var second]`). Use a rest element (`...`) to ignore trailing list elements.
- **Map Pattern**: Matches key-value targets (e.g. `{'id': var id}`). Ignores keys that are not explicitly matched.
- **Object Pattern**: Matches class instances and extracts property values (e.g. `User(:final name)`).
## Workflow: Designing Pattern Matching Logic
Follow this checklist to implement clean pattern matching structures:
- [ ] **Determine the structure**: Identify if the source is an Enum, a Sealed Class hierarchy, a Record, or raw JSON.
- [ ] **Select switch structure**: Choose Switch Expressions for value assignments, or Switch Statements for side effects.
- [ ] **Define case bindings**: Construct explicit Map, List, or Object patterns to extract needed fields into scoped variables.
- [ ] **Inject guards**: Add `when` expressions for conditional boundary checks.
- [ ] **Verify exhaustiveness**: If using a sealed class or enum, let the compiler enforce exhaustiveness. If using open types, include a wildcard `_` fallback.
- [ ] **Validate compiler output**: Run `dart analyze` to ensure there are no unhandled cases or type mismatches.
## Examples
### JSON Validation and Parsing
Validate structure and extract values in a single step using map destructuring.
```dart
void processPayload(Map<String, dynamic> payload) {
if (payload case {'status': 'success', 'data': [String title, int count]}) {
print('Product: $title, Inventory: $count');
} else {
print('Invalid payload structure received');
}
}
```
### Exhaustive Sealed Class Matching
Use sealed classes to force exhaustive compile-time verification when executing domain logic.
```dart
sealed class NetworkState {}
class NetworkIdle extends NetworkState {}
class NetworkLoading extends NetworkState {}
class NetworkSuccess extends NetworkState {
final String response;
NetworkSuccess(this.response);
}
class NetworkFailure extends NetworkState {
final String error;
NetworkFailure(this.error);
}
// Compiler guarantees all sub-states are handled without requiring a default fallback
String getStatusMessage(NetworkState state) {
return switch (state) {
NetworkIdle() => 'Waiting to connect...',
NetworkLoading() => 'Loading data...',
NetworkSuccess(:final response) => 'Data loaded: $response',
NetworkFailure(:final error) => 'Failed: $error',
};
}
```
### Record Destructuring and Swapping
```dart
// Destructuring a positional and named return record:
(String name, {int age}) getUser() => ('Alice', age: 30);
void main() {
final (name, age: userAge) = getUser();
print('$name is $userAge years old');
// Value swapping without temp variables:
var (x, y) = (1, 2);
(y, x) = (x, y);
}
```
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- License
- MIT
- Price unconfirmed
- We have not confirmed a price for this skill. Existing source and install links remain available.
Free to get does not mean free to run. Price labels are not safety ratings. Submit pricing information →
Skill source recorded
Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.
Review before install: Avoid automatic install
License: MIT
- Potential broker, wallet, exchange, or real-money execution surface; sandbox and explicit approval are required
- Low GitHub adoption signal
- AI review approval is missing
- This skill may touch real-money trading, broker, wallet, or exchange operations; use only in a sandbox with explicit approval.
- Quality score needs review
- GitHub adoption: 29 GitHub stars
- Stars/forks activity: 29 stars, 4 forks; issue activity unavailable in current metadata
- Review status: AI review approval is missing
Listed tools are metadata hints, not tested compatibility. Agent prompts are suggested handoffs.
Start with one small task
- 1Read the source. Confirm the input, expected output, dependencies and permissions.
- 2Ask your agent for a plan. Approve setup and any costs before running a small isolated test.
- 3Check the output and changed files. Report only what actually ran; keep the source revision for reproduction.
Check the source for dependencies, API keys and third-party costs. A public repository does not mean every service is free.
Source & usage notes
IndexedStatic Checked
Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.
- Source repository
- dhruvanbhalara/skills
- License
- MIT
- Version
- Unknown
- Last GitHub push
- Aug 30, 2026
- Registry updated
- Sep 11, 2026
- Instruction path
- skills/dart/dart-use-pattern-matching/SKILL.md @ a74a6fbe04a0
Version reported in registry metadata; check source releases before relying on it.
Quality
53/100
Needs review
Trust
68/100
Sandbox only
Audit
74/100
Risky
- Potential broker, wallet, exchange, or real-money execution surface; sandbox and explicit approval are required
- Low GitHub adoption signal
- AI review approval is missing
- This skill may touch real-money trading, broker, wallet, or exchange operations; use only in a sandbox with explicit approval.
- Quality score needs review
- GitHub adoption: 29 GitHub stars
- Stars/forks activity: 29 stars, 4 forks; issue activity unavailable in current metadata
- Review status: AI review approval is missing
- Verified installs
- —
- Outcomes
- —
Copies are not installs. Installation counts require a reported successful installation; they are not a blanket quality guarantee.
Agent access
This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.
More details
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"audit": "https://www.openagentskill.com/skills/dhruvanbhalara-dart-use-pattern-matching/audit",
"eval": "https://www.openagentskill.com/api/agent/evals?slug=dhruvanbhalara-dart-use-pattern-matching&task=Use%20dart-use-pattern-matching%20in%20an%20agent%20workflow&max_risk=medium",
"resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20dart-use-pattern-matching%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
"receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20dart-use-pattern-matching%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
"install": "https://www.openagentskill.com/api/skills/dhruvanbhalara-dart-use-pattern-matching/install",
"manifest": "https://www.openagentskill.com/api/registry/manifest/dhruvanbhalara-dart-use-pattern-matching"
}
}For the creator
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- Creator
- dhruvanbhalara
- Source
- dhruvanbhalara/skills
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- OpenAgentSkill community index
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