JSFiddle - React, Tailwind, and code Playground
by Taleeb Anwar
HTML
<textarea id="a"></textarea>
JavaScript
var s={"abc":{"a":123}};
function t(h){
var x={};
x[h] = {"b":345};
return x;
}
var y = t("abc");
s.abc = Object.assign(s.abc,y.abc);
document.getElementById("a").value = JSON.stringify(s);