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dart-logic-patterns

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English

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Translation

Chinese

Algorithms & Logic

算法与逻辑

The efficiency of your business logic directly impacts battery life and responsiveness.

业务逻辑的效率会直接影响电池续航和应用响应速度。

Complexity Analysis

复杂度分析

Big O Awareness: Understand the cost of your operations. Avoid O(n²) or higher on the main thread for datasets larger than a few hundred items.
Data Structure Selection:
- ```
Map
```
  : Fast key-based lookups.
- ```
Set
```
  : Fast unique item management.
- ```
List
```
  : Fast indexing and sequential access.
- ```
LinkedHashSet/Map
```
  : Preserves insertion order while providing fast lookups.

大O表示法认知：了解你所执行操作的开销。对于包含数百项以上的数据集，避免在主线程中使用O(n²)或更高复杂度的操作。
数据结构选择:
- ```
Map
```
  ：基于键的快速查找
- ```
Set
```
  ：高效的唯一元素管理
- ```
List
```
  ：快速索引和顺序访问
- ```
LinkedHashSet/Map
```
  ：保留插入顺序的同时提供快速查找能力

Logic Patterns

逻辑模式

Debouncing: Delay execution until a user stops interacting (e.g., search-as-you-type).
Throttling: Limit execution to at most once every interval (e.g., scrolling events).
Memoization: Cache the results of expensive pure functions based on their arguments. Use
```
package:memoize
```
or custom implementations.

Debouncing（防抖）：延迟执行直到用户停止交互（例如：输入实时搜索场景）。
Throttling（节流）：限制执行频率，每个时间间隔内最多触发一次（例如：滚动事件处理）。
Memoization（记忆化）：基于入参缓存高开销纯函数的执行结果，可使用
```
package:memoize
```
或自定义实现。

Search & Sort

搜索与排序

Binary Search: Use for sorted lists to transform O(n) searches into O(log n).
Efficient Sorting: Use Dart's built-in
```
list.sort()
```
, which uses highly optimized algorithms. Provide targeted
```
Comparable
```
implementations for custom objects.

Binary Search（二分查找）：在有序列表中使用，可将O(n)复杂度的搜索优化为O(log n)。
高效排序：使用Dart内置的
```
list.sort()
```
，它采用了高度优化的算法，针对自定义对象可提供对应的
```
Comparable
```
实现。

Business Logic Organization

业务逻辑组织

Pure Functions: Keep business logic in pure, testable functions outside of UI classes.
Fail Fast: Use guard clauses to handle edge cases and invalid states early.
Validation Logic: Keep complex validation in a separate domain layer, reusable across different screens.

纯函数：将业务逻辑保存在UI类之外的可测试纯函数中。
快速失败：使用卫语句提前处理边界情况和非法状态。
校验逻辑：将复杂的校验逻辑放在独立的领域层，可在不同页面间复用。