====== !! Double not operator ======
The double NOT operator (!!) in JavaScript is a bit of a trick that converts any value to its corresponding boolean value.\\
How it works:
- The first **!** negates the value, converting it to its opposite boolean value. If the original value is truthy, this results in **false**, and if the original value is falsy, this results in **true**.
- The second **!** negates it again, so you're back to the original truthiness of the value, but now as a boolean **true** or **false** instead of the original value.
Examples:
!!true; // true
!!false; // false
!!null; // false
!!undefined; // false
!!0; // false
!!1; // true
!!'hello'; // true
!!''; // false
This trick is often used when you want to ensure that a value is a boolean, and it behaves in the same way as if you had used the **Boolean constructor**. It's a more concise way to force a value into a boolean context, and it's used quite frequently in JavaScript code.