wehub-skill-sync
29 lines
629 B
Markdown
29 lines
629 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() 用于独立操作
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当异步操作之间没有依赖关系时，使用 `Promise.all()` 并发执行它们。
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**错误（顺序执行，3 次往返）：**
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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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**正确（并行执行，1 次往返）：**
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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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