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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)
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