Using GET requests in JavaScript

Let there be some object on a server:

server.jslet obj = {1: 'a', 2: 'b', 3: 'c'};

export default function({get}) {
  
}

Let's make three links that send GET parameters to the server:

public/index.html<a href="/handler/?key=1">1</a>
<a href="/handler/?key=2">2</a>
<a href="/handler/?key=3">3</a>

Now we will correct the server code so that following the link shows the corresponding object element:

server.jsexport default {
  '/handler/': function({get}) {
    let obj = {1: 'a', 2: 'b', 3: 'c'};
    return obj[get.key];
  }
}
Задание 1

Let a server have an array with users:

server.jslet arr = [
  'user1', 'user2', 'user3'
];

Make links that show relevant users in the browser.

Задание 2

Modify the previous task so that if there is no element in the array with the passed key, an error is sent to the browser.