示例
collection 1.19.1: Compare two Dart Lists, Maps or Sets by their contents, and use one as a cache key, when == on a collection is identity
已验证示例 — pub collection 1.19.1: Compare two Dart Lists, Maps or Sets by their contents, and use one as a cache key, when == on a collection is identity.…
sha256:7227421d006842fac6a96b0d2190f4a93f7cbbd5a2ee8a34116cb7c2f7b20d1c
本网络只提供一件事：能构建的样本。它在沙箱中运行并保留签名回执。它不评级、不担保——同样的代码能否在你的环境构建，它没有测量过。
提交了通过的契约回执的不同签名密钥数量。为 1 表示只有作者；大于 1 表示还有其他人构建过。密钥是自行生成的，背后没有注册身份，因此计的是密钥而非人。
MIT-0
执行证据
声明的环境与签名的运行分开呈现，你可以看到这个样本究竟运行了什么、在哪里运行。
- 证据依据
- 签名契约通过
- 验证回执
- 2
- 构建过它的签名密钥
- 2
声明的环境
dart 3 linux x64 dart 3 dart pub
验证运行环境
| 环境 | 契约 | 阶段 | 运行日期 |
|---|---|---|---|
| dart 3 · linux alpine/x64 · docker ed25519:a2ec939a4c60e243 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · pub@1 |
2026-08-14 |
| dart 3 · linux debian/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · pub@1 |
2026-08-18 |
案例
HOW- 目标
- Compare two Dart Lists, Maps or Sets by their contents, and use one as a cache key, when == on a collection is identity
- 符号
-
- ListEquality
- MapEquality
- SetEquality
- IterableEquality
- DeepCollectionEquality
- DeepCollectionEquality.unordered
- DeepCollectionEquality.hash
- groupBy
- firstWhereOrNull
- whereNotNull
- HashMap
- 环境
- dart 3
- 创建时间
- 2026-08-14T13:05:28Z
契约
- assert two Lists with the same contents are not ==, and neither are two Maps nor two Sets, while package:test's equals matcher deep-compares the same values, nested ones included, and passes
- assert a const collection is canonicalized, so const [1, 2] is identical to const [1, 2], that canonicalization is per type argument, and that copying the list loses the equality again
- assert ListEquality compares in order while MapEquality and SetEquality do not, their hashes agree where their equals does, and IterableEquality compares a List against a Set
- assert ListEquality and MapEquality go exactly one level deep, so nested collections are compared with == and only match when the inner values are const-canonicalized
- assert DeepCollectionEquality recurses through nested maps, lists and sets, is already order-insensitive for Sets but not for Lists, that unordered() extends that to Lists as a multiset, and that non-collections fall through to the base equality
- assert a Map used as a key in a plain Map only matches the instance it was stored under, so the cache grows and never hits, while a HashMap given DeepCollectionEquality's equals and hash matches a rebuilt key whatever order its literal was written in
- assert equal structures produce equal DeepCollectionEquality hashes, that the ordered and unordered hashes track their own equalities, and that a HashMap given equals without hashCode misses 2000 freshly built keys without calling the equals it was given even once
- assert groupBy returns exact groups keyed in first-occurrence order, firstWhereOrNull returns null where the SDK's firstWhere throws StateError, and whereNotNull yields the same List<int> as the SDK's nonNulls that deprecates it
- assert Dart records compare by value and work as Map keys, but a record holding a List is back to identity
文件
- csx.json
- lib/equality.dart
- pubspec.lock
- pubspec.yaml
- test/contract_test.dart