wehub-skill-sync
29 lines
572 B
Markdown
29 lines
572 B
Markdown
---
|
|
|
|
title: Cache Property Access in Loops
|
|
impact: LOW-MEDIUM
|
|
impactDescription: 减少属性查找次数
|
|
tags: javascript, loops, optimization, caching
|
|
|
|
## 在循环中缓存属性访问
|
|
|
|
在热点路径中缓存对象属性的查找结果。
|
|
|
|
**错误做法（N 次迭代 × 3 次查找）：**
|
|
|
|
```typescript
|
|
for (let i = 0; i < arr.length; i++) {
|
|
process(obj.config.settings.value)
|
|
}
|
|
```
|
|
|
|
**正确做法（总共 1 次查找）：**
|
|
|
|
```typescript
|
|
const value = obj.config.settings.value
|
|
const len = arr.length
|
|
for (let i = 0; i < len; i++) {
|
|
process(value)
|
|
}
|
|
```
|