The !! operator in JavaScript is used to convert a value to a boolean (either true or false).
The first ! (logical NOT) negates the value, converting a truthy value to false and a falsy value to true.
The second ! negates the result of the first !, effectively converting the original value to its boolean equivalent.
JavaScript considers certain values as "truthy" (values that evaluate to true in a boolean context) and others as "falsy" (values that evaluate to false in a boolean context).