JSFiddle - React, Tailwind, and code Playground

HTML

<div id="output">output log</div>

JavaScript

document.addEventListener("DOMContentLoaded",function(){

    var fn_str = "myfunc";
    var myfunc = new Function("return { "+fn_str+": function() { " +
    " var sum = 0; for(var i=0, e=arguments.length; i<e; i++) " +
    " { sum += (typeof arguments[i] === 'number' ?  arguments[i] : 0); } " +
    " return sum; }}");
    window[fn_str] = myfunc()[fn_str];
    var lollerskates = window[fn_str];
    
    document.querySelector("#output").innerHTML = lollerskates(1,2,3,4);
},false);