JSFiddle - React, Tailwind, and code Playground

by Yurii Predborskyi

JavaScript

let a = 'abc', b;
let undef = {
	a: a,
  b: b
}

document.write('v1, define undefined property:' + JSON.stringify(undef) + '<br>');
console.log(undef);

undef.a = undefined;

document.write('v2, redefine defined property to undefined:' + JSON.stringify(undef));
console.log(undef);