https://unpkg.com/javascript-playgrounds@1.1.0/public/index.html#data=%7B%22code%22%3A%22const%20supply%20%3D%20%7B%7D%5Cnconst%20val%20%3D%20parseInt(undefined)%5Cnconsole.log(val)%22%7D parseFloat(undefined) is NaN parseInt(undefined) is NaN logging is showing `null`
