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  1. # `reduce()`
  2. The reduce method reduces the collection to a single value, passing the result of each iteration into the subsequent iteration:
  3. ```js
  4. const collection = collect([1, 2, 3]);
  5. const total = collection.reduce((carry, item) => carry + item);
  6. // 6
  7. ```
  8. The value for `carry` on the first iteration is null; however, you may specify its initial value by passing a second argument to reduce:
  9. ```js
  10. const total = collection.reduce((carry, item) => carry + item, 4);
  11. // 10
  12. ```
  13. [View source on GitHub](https://github.com/ecrmnn/collect.js/blob/master/src/methods/reduce.js)