JSFiddle - React, Tailwind, and code Playground

HTML

<a href="javascript:randomFunction();" >Call a function</a>

JavaScript

function functionName() 
{
   var myName = functionName.caller.toString();
   myName = myName.substr('function '.length);
   myName = myName.substr(0, myName.indexOf('('));
   return myName;
}

function randomFunction(){
    var proof = "This proves that I found the name '" + functionName() + "'";
	alert(proof);
}