JSFiddle - React, Tailwind, and code Playground
JavaScript
var a;
a = 1;
console.log(delete a); // prints 'false'
b = 1;
console.log(delete b); // prints 'true'
var a;
a = 1;
console.log(delete a); // prints 'false'
b = 1;
console.log(delete b); // prints 'true'