What is the best way to get the absolute link of an <a> tag using JavaScript/jQuery?

HTML:

<a href="3.html">No. 3</a>

JS:

$('a').attr('href') // would return the string "3.html"

How can I get the string of the full path:

$('a').fullLinkAttr('href') // returns https://www.example.com/3.html

>Solution :

Getting the .href solves the problem easy:

const a = document.getElementById("a"),
  b = document.getElementById("b"),
  c = document.getElementById("c");
  
console.log("A:", a.href);
console.log("B:", b.href);
console.log("C:", c.href);

<a href="/t/hello" id="a">A</a>
<a href="hello.html" id="b">B</a>
<a href="https://stackoverflow.com/testing..." id="c">C</a>

Or a pointed out by Kaiido in the comments one could use the URL constructor:

const absolutePath = new URL("/absolute/or/relative/url", document.baseURI).href;

With jQuery:

const absolutePath = new URL($("a").attr("href"), document.baseURI).href;