HouYunFei
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- 添加 sections 定义文件，包含性能优化各领域分类 - 添加规则模板文件，规范文档结构和标签定义 - 添加异步操作优化规则，包括防止瀑布流、并行化、延迟等待等 - 添加包大小优化规则，包括避免桶式导入、动态导入、预加载等 - 添加服务端性能优化规则，包括 API 路
29 lines
654 B
Markdown
29 lines
654 B
Markdown
---
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title: Promise.all() for Independent Operations
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impact: CRITICAL
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impactDescription: 2-10× improvement
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tags: async, parallelization, promises, waterfalls
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---
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## Promise.all() for Independent Operations
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When async operations have no interdependencies, execute them concurrently using `Promise.all()`.
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**Incorrect (sequential execution, 3 round trips):**
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```typescript
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const user = await fetchUser()
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const posts = await fetchPosts()
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const comments = await fetchComments()
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```
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**Correct (parallel execution, 1 round trip):**
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```typescript
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const [user, posts, comments] = await Promise.all([
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fetchUser(),
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fetchPosts(),
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fetchComments()
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])
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```
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