---
title: pack()
---
The `pack()` store method is used to arrange items into a
pattern layout.
The core library uses this method to arrange stacks of parts to
generate layouts for drafted patterns.
`pack()` is implemented as a store method to allow you to override this
method and implement your own algorithm to generate the layout.
## Signature
```js
Object store.pack(
Array items,
Pattern pattern,
)
```
## Example
```js
const result = store.pack(parts, pattern)
const layout_width = result.width
const layout_height = result.height
```
## Notes
An optimized `pack()` store method is provided by
[plugin-bin-pack](/reference/plugins/bin-pack)
which is part of [core-plugins](/reference/plugins/core) and loaded
by the core library by default.
The core library also provides a basic, unoptimized `pack()` store method
that is used if core plugins are not loaded.
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