Automatic Memory Cleanup

In JavaScript, you don't need to manually delete objects from memory. The engine does it for you.

Main Criterion: Reachability

An object remains in memory as long as it is " reachable " from a root (e.g., the global window variable).

let user = { name: "John" };
user = null; // The reference is lost. Now the object { name: "John" } is unreachable 
             // and will be removed by the garbage collector.