> For the complete documentation index, see [llms.txt](https://osl.mistium.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://osl.mistium.com/legacy-osl-originos/prototype-helpers/.append.md).

# number.append

> ⚠️ **Not a number method.** `.append()` works only on strings. See [strings/.append.md](https://github.com/Mistium/OSL-Docs/blob/main/methods/strings/.append.md).

## Description

Treats the **number** as a string, appends `val`, and returns the resulting **string**.

## Parameters

* **val** - value to append (converted to string first).

## Usage

```javascript
log 42.append("px") // "42px"
```