> For the complete documentation index, see [llms.txt](https://hannahpun.gitbook.io/leetcode-note/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hannahpun.gitbook.io/leetcode-note/tools/chu-li-array-xiao-pie-bu.md).

# 處理 Array 小撇步

#### 知道 index 情況要塞值

```javascript
var result = []
// good for Memory
result[i] = xx

// bad
result.push(xx)
```