Add useFetch snippet

snippets/useFetch.md

@@ -0,0 +1,51 @@
+---
+title: useFetch
+tags: hooks,effect,state,intermediate
+---
+
+A hook that implements `fetch` in a declarative manner.
+
+- Create a custom hook that takes a `url` and `options`.
+- Use the `React.useState()` hook to initialize the `response` and `error` state variables.
+- Use the `React.useEffect()` hook to anychronously call `fetch()` and update the state varaibles accordingly.
+- Return an object containting the `response` and `error` state variables.
+
+```jsx
+const useFetch = (url, options) => {
+  const [response, setResponse] = React.useState(null);
+  const [error, setError] = React.useState(null);
+
+  React.useEffect(() => {
+    const fetchData = async () => {
+      try {
+        const res = await fetch(url, options);
+        const json = await res.json();
+        setResponse(json);
+      } catch (error) {
+        setError(error);
+      }
+    };
+    fetchData();
+  }, []);
+
+  return { response, error };
+};
+```
+
+```jsx
+const ImageFetch = props => {
+  const res = useFetch('https://dog.ceo/api/breeds/image/random', {});
+  if (!res.response) {
+    return <div>Loading...</div>;
+  }
+  const dogName = res.response.status;
+  const imageUrl = res.response.message;
+  return (
+    <div>
+      <img src={imageUrl} alt="avatar" width={400} height="auto" />
+    </div>
+  );
+};
+
+ReactDOM.render(<ImageFetch />, document.getElementById('root'));
+```