My-Weekly-ToDo-List/.opencode/skills/react-best-practices/rules/js-cache-property-access.md
mARTin d92a8c7210 feat: add task actions (notes/delete) and refine animation logic
- Added 'onDelete' and 'onNotes' support to TaskItem.
- Implemented hover actions (Delete and Notes icons) for tasks.
- Added Notes Modal for editing task markdown content.
- Simplified navigation animation to remove blank flash (single-phase slide-in).
- Fixed syntax error in updateTask function.
- Updated styles for modal and task actions.
2026-02-01 12:25:53 +01:00

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---
title: Cache Property Access in Loops
impact: LOW-MEDIUM
impactDescription: reduces lookups
tags: javascript, loops, optimization, caching
---
## 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)
}
```