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Update docs/source/tutorial/mutations.md

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Co-Authored-By: Peggy Rayzis <peggyrayzis@gmail.com>
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Hugh Willson
2019-08-05 13:17:37 -04:00
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@@ -9,7 +9,7 @@ With Apollo Client, updating data from a graph API is as simple as calling a fun
## What is the useMutation hook?
The `useMutation` Hook is another important building block in an Apollo app. It leverages React's [Hooks API](https://reactjs.org/docs/hooks-intro.html) to provide a function to execute a GraphQL mutation. Additionally, it tracks the loading, completion, and error state of that mutation.
The `useMutation` hook is another important building block in an Apollo app. It leverages React's [Hooks API](https://reactjs.org/docs/hooks-intro.html) to provide a function to execute a GraphQL mutation. Additionally, it tracks the loading, completion, and error state of that mutation.
Updating data with a `useMutation` Hook from `@apollo/react-hooks` is very similar to fetching data with a `useQuery` Hook. The main difference is that the first value in the `useMutation` result tuple is a **mutate function** that actually triggers the mutation when it is called. The second value in the result tuple is a result object that contains loading and error state, as well as the return value from the mutation. Let's see an example: