JSFiddle - React, Tailwind, and code Playground

HTML

<p>
Hypothesis: "If a variable has a value of null or undefined, its value is false."
</p>
<p id="answer">hi</p>

JavaScript

const setAnswer = (text) => {
	document.getElementById("answer").innerHTML = text;
}

const _undefined = undefined;
const _null = null;

if ((_undefined == false) ||
    (_undefined === false) ||
    (Object.is(_undefined, false)) ||
    (_null == false) ||
    (_null === false) ||
    (Object.is(_null, false))) {
	setAnswer("Correct");
} else {
  setAnswer("Incorrect");
}