JSFiddle - React, Tailwind, and code Playground

by sanford

HTML

<PRE id="result"></PRE>

JavaScript

var myObject = {a: 'one', b: 'two', c: 3};

$('result').appendText(Object.keyOf(myObject, 'two')+'\n'); // returns 'b'
$('result').appendText(Object.keyOf(myObject, 3)+'\n' ); // returns 'c'
$('result').appendText( Object.keyOf(myObject, 'four')+'\n' ); // returns null, according to docs s/b false