> For the complete documentation index, see [llms.txt](https://data-js.gitbook.io/data-js/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://data-js.gitbook.io/data-js/determine-the-number-of-values-in-an-array.md).

# Determine the number of values ​​in an array

```
var app = new Data([12,13,"Hello, world"],{
    getLength: true
});
```

####