delete operator in JavaScript

You can delete elements of objects using the delete operator. Let's look at examples. Suppose we are given such an object:

let obj = {a: 1, b: 2, c: 3};

Let's delete one of the elements of our object:

delete obj.b;

Let's see what we got:

console.log(obj); // shows {a: 1, c: 3}

Tell me what will be output to the console as a result of executing the following code:

let obj = {x: 1, y: 2, z: 3}; delete obj.x; console.log('x' in obj);