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# `avg()`
The avg method returns the average of all items in the collection:
```js
collect([1, 3, 3, 7]).avg();
// 3.5
```
If the collection contains nested arrays or objects, you should pass a key to use for determining which values to calculate the average:
```js
const collection = collect([
{
name: 'My story',
pages: 176,
},
{
name: 'Fantastic Beasts and Where to Find Them',
pages: 1096,
},
]);
collection.avg('pages');
// 636
```
You may also define a callback function
```js
const collection = collect([
{
name: 'My story',
pages: 176,
},
{
name: 'Fantastic Beasts and Where to Find Them',
pages: 1096,
},
]);
collection.avg(book => book.pages);
// 636
```
[View source on GitHub](https://github.com/ecrmnn/collect.js/blob/master/src/methods/avg.js)