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+---
+title: useAsync
+tags: hooks,state,reducer,advanced
+---
+
+A hook that handles asynchronous calls.
+
+- Create a custom hook that takes a handler function, `fn`.
+- Define a reducer function and an initial state for the custom hook's state.
+- Use the `React.useReducer()` hook to initialize the `state` variable and the `dispatch` function.
+- Define a `run` function that will run the provided callback, `fn`, while using `dispatch` to update `state` as necessary.
+- Return an object containting the the properties of `state` (`value`, `error` and `loading`) and the `run` function.
+
+```jsx
+const useAsync = (fn) => {
+  const initialState = { loading: false, error: null, value: null };
+  const stateReducer = (_, action) => {
+    switch (action.type) {
+      case 'start':
+        return { loading: true, error: null, value: null};
+      case 'finish':
+        return { loading: false, error: null, value: action.value};
+      case 'error':
+        return { loading: false, error: action.error, value: null};
+    }
+  }
+
+  const [state, dispatch] = React.useReducer(stateReducer, initialState);
+
+  const run = async (args = null) => {
+    try {
+      dispatch({ type: 'start' });
+      const value = await fn(args);
+      dispatch({ type: 'finish', value });
+    } catch (error) {
+      dispatch({ type: 'error', error });
+    }
+  };
+  
+  return { ...state, run };
+};
+```
+
+```jsx
+const RandomImage = props => {
+  const imgFetch = useAsync(url => fetch(url).then(response => response.json())); 
+  
+  return (
+    <div>
+      <button
+        onClick={() => imgFetch.run('https://dog.ceo/api/breeds/image/random')}
+        disabled={ imgFetch.isLoading }
+      >
+        Load image
+      </button>
+      <br/>
+      { imgFetch.loading && <div>Loading...</div> }    
+      { imgFetch.error && <div>Error { imgFetch.error }</div> }
+      { imgFetch.value && <img src={ imgFetch.value.message } alt="avatar" width={400} height="auto" />}
+    </div>
+  );
+};
+
+ReactDOM.render(<RandomImage />, document.getElementById('root'));
+```