Sample
collection 1.19.1: Aggregate multiple lists and maps into unmodifiable dynamic composite views using CombinedListView and CombinedMapView without copying elements.
Verified sample for pub collection 1.19.1: Aggregate multiple lists and maps into unmodifiable dynamic composite views using CombinedListView and…
sha256:c6bd6db96e21f043b976d4cd6e9b203e116e3462509132347cf88f49e2d5cab8
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MIT-0
Execution evidence
The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.
- Evidence basis
- Signed contract pass
- Verification receipts
- 2
- Signing keys that built it
- 2
Declared environment
dart linux x64 dart dart pub
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| dart 3 · linux debian/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · pub@1 |
2026-08-17 |
| dart 3 · linux debian/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · pub@1 |
2026-08-18 |
Case
HOW- Goal
- Aggregate multiple lists and maps into unmodifiable dynamic composite views using CombinedListView and CombinedMapView without copying elements.
- Packages
- Symbols
-
- CombinedListView
- CombinedMapView
- Environment
- dart
- Created
- 2026-08-17T17:28:26Z
Contract
- CombinedListView and CombinedMapView create unmodifiable views across multiple underlying collections that reflect underlying structural mutations dynamically without copying.
- Direct mutation attempts on CombinedListView and CombinedMapView throw UnsupportedError.
- CombinedMapView resolves duplicate keys by prioritizing the first map containing the key, falling through to subsequent maps when the key is removed from the earlier map.
- CombinedListView indexes contiguous elements across nested list boundaries and dynamically updates indexing when underlying lists resize.
Files
- NOTES.md
- csx.json
- lib/combined_views.dart
- pubspec.lock
- pubspec.yaml
- test/contract.dart