# in operator in JavaScript

Using the `in` operator, you can check for the presence of a property in an object. Let's look at an example. Suppose we are given such an object:

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

Let's check if our object has some property:

`console.log('b' in obj); // shows true`

Now let's check for a non-existent property:

`console.log('x' in obj); // shows false`

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}; console.log('x' in obj); console.log('w' in obj);`
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