HouYunFei
fb79a15508
- 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
51 lines
1.1 KiB
Markdown
51 lines
1.1 KiB
Markdown
---
|
|
title: Early Return from Functions
|
|
impact: LOW-MEDIUM
|
|
impactDescription: avoids unnecessary computation
|
|
tags: javascript, functions, optimization, early-return
|
|
---
|
|
|
|
## Early Return from Functions
|
|
|
|
Return early when result is determined to skip unnecessary processing.
|
|
|
|
**Incorrect (processes all items even after finding answer):**
|
|
|
|
```typescript
|
|
function validateUsers(users: User[]) {
|
|
let hasError = false
|
|
let errorMessage = ''
|
|
|
|
for (const user of users) {
|
|
if (!user.email) {
|
|
hasError = true
|
|
errorMessage = 'Email required'
|
|
}
|
|
if (!user.name) {
|
|
hasError = true
|
|
errorMessage = 'Name required'
|
|
}
|
|
// Continues checking all users even after error found
|
|
}
|
|
|
|
return hasError ? { valid: false, error: errorMessage } : { valid: true }
|
|
}
|
|
```
|
|
|
|
**Correct (returns immediately on first error):**
|
|
|
|
```typescript
|
|
function validateUsers(users: User[]) {
|
|
for (const user of users) {
|
|
if (!user.email) {
|
|
return { valid: false, error: 'Email required' }
|
|
}
|
|
if (!user.name) {
|
|
return { valid: false, error: 'Name required' }
|
|
}
|
|
}
|
|
|
|
return { valid: true }
|
|
}
|
|
```
|