Js Cache Property Access

---
name: js-cache-property-access
description: Cache Property Access in Loops. Use when you need help with js cache property access.
license: CC-BY-NC-SA-4.0
metadata:
  risk: unknown
  source: community
  kind: mode
  category: rules
---

## Cache Property Access in Loops

Cache object property lookups in hot paths.

**Incorrect (3 lookups × N iterations):**

```typescript
for (let i = 0; i < arr.length; i++) {
  process(obj.config.settings.value);
}
```

**Correct (1 lookup total):**

```typescript
const value = obj.config.settings.value;
const len = arr.length;
for (let i = 0; i < len; i++) {
  process(value);
}
```