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# `sum()` The sum method returns the sum of all items in the collection: ```js collect([1, 2, 3]).sum(); // 6 ``` If the collection contains nested arrays or objects, you should pass a key to use for determining which values to sum: ```js const collection = collect([ { name: 'My story', pages: 176 }, { name: 'Fantastic Beasts and Where to Find Them', pages: 1096 }, ]); collection.sum('pages'); // 1272 ``` In addition, you may pass your own callback to determine which values of the collection to sum: ```js const collection = collect([ { name: 'Desk', colors: ['Black', 'Mahogany'] }, { name: 'Chair', colors: ['Black'] }, { name: 'Bookcase', colors: ['Red', 'Beige', 'Brown'] }, ]); const total = collection.sum(product => product.colors.length); // 6 ``` [View source on GitHub](https://github.com/ecrmnn/collect.js/blob/master/src/methods/sum.js)
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