dart-optimization

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Performance in Dart goes beyond UI rendering; it's about efficient execution and smart resource utilization.

Dart中的性能优化不仅限于UI渲染，更关乎高效执行与智能资源利用。

Standardize Types: Avoid
```
dynamic
```
. Use explicit types or
```
Object?
```
. Statically typed code allows the compiler to perform far better optimizations.
Efficient Collections:
- Use
```
Set
```
  for average O(1) containment checks.
- Use
```
List
```
  for ordered indexing.
- Prefer
```
Iterable
```
  methods (
```
map
```
  ,
```
where
```
  ) for readability, but use
```
for
```
  loops in performance-critical hot paths.
Inlining: Small getters and trivial functions are often inlined by the VM/AOT, but keeping them simple ensures this optimization happens.

标准化类型：避免使用
```
dynamic
```
。使用显式类型或
```
Object?
```
。静态类型代码能让编译器执行更出色的优化。
高效集合：
- 使用
```
Set
```
  实现平均O(1)时间复杂度的存在性检查。
- 使用
```
List
```
  进行有序索引操作。
- 为了可读性优先使用
```
Iterable
```
  方法（如
```
map
```
  、
```
where
```
  ），但在性能关键的热路径中使用
```
for
```
  循环。
内联优化：小型getter和简单函数通常会被VM/AOT内联，但保持函数简洁才能确保该优化生效。

Final & Const: Declare variables as
```
final
```
whenever possible. Use
```
const
```
constructors for widgets and data models to enable compile-time allocation and reduce runtime garbage collection pressure.
Ternary vs If-Else: In Dart, they are generally equivalent, but prioritize readability. Use
```
switch
```
expressions (Dart 3+) for exhaustive and efficient pattern matching.

Final与Const：尽可能将变量声明为
```
final
```
。为Widget和数据模型使用
```
const
```
构造函数，以实现编译时分配，减少运行时垃圾回收压力。
三元表达式与If-Else：在Dart中，二者性能基本相当，但应优先考虑可读性。对于全面且高效的模式匹配，使用switch表达式（Dart 3+）。

Minimize Work in Loops: Extract calculations and object creations outside of loops.
Collection Literals: Use literal syntax
```
[]
```
or
```
{}
```
instead of constructors like
```
List()
```
for brevity and minor performance gains.

减少循环内操作：将计算和对象创建逻辑移至循环外部。
集合字面量：使用字面量语法
```
[]
```
或
```
{}
```
替代
```
List()
```
等构造函数，以简化代码并获得小幅性能提升。

DevTools CPU Profiler: Identify hot paths and "heavy" functions.
Benchmarking: Use
```
package:benchmark_harness
```
for scientific performance measurement of non-UI logic.