Update httpGet.md

snippets/httpGet.md

@@ -2,20 +2,28 @@
 
 Makes a `GET` request to the passed URL.
 
-Use `XMLHttpRequest` web api to make a `get` request to the given `url`.
-Handle the `onload` event, by console logging the `responseText`.
+Use [`XMLHttpRequest`](https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/Using_XMLHttpRequest) web api to make a `get` request to the given `url`.
+Handle the `onload` event, by calling the given `callback` the `responseText`.
 Handle the `onerror` event, by running the provided `err` function.
+Omit the third argument, `err`, to log errors to the console's `error` stream by default.
 
 ```js
-const httpGet = (url, err = console.error) => {
+const httpGet = (url, callback, err = console.error) => {
   const request = new XMLHttpRequest();
   request.open("GET", url, true);
-  request.onload = () => console.log(request.responseText);
+  request.onload = () => callback(request.responseText);
   request.onerror = () => err(request);
   request.send();
 };
 ```
 
 ```js
-httpGet('https://jsonplaceholder.typicode.com/posts'); // 'Console logs JSON of 100 posts'
+httpGet('https://jsonplaceholder.typicode.com/posts/1', console.log); /* 
+Logs: {
+  "userId": 1,
+  "id": 1,
+  "title": "sunt aut facere repellat provident occaecati excepturi optio reprehenderit",
+  "body": "quia et suscipit\nsuscipit recusandae consequuntur expedita et cum\nreprehenderit molestiae ut ut quas totam\nnostrum rerum est autem sunt rem eveniet architecto"
+}
+*/
 ```