JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.4/themes/ui-lightness/jquery-ui.css">

JavaScript

var a = "check";

function some() {
    return "value";
}

var b;


if (a == "check" && (b = some())) {
    alert("it worked");
}