At that point they become unneeded and their allocated memory should be reclaimed. They will go out of scope after the function call has completed. In the following example, two objects are created with properties that reference one another, thus creating a cycle. There is a limitation when it comes to circular references.
Z = null // The 'a' property of the object originally in x // has zero references to it. However its 'a' property is still referenced by // the 'z' variable, so it cannot be freed. Y = "mozilla" // The object that was originally in 'x' has now zero // references to it. This object now has 2 references: one as a property, // the other as the 'z' variable. a // Reference to 'a' property of the object. X = 1 // Now, the object that was originally in 'x' has a unique reference // embodied by the 'y' variable. let y = x // The 'y' variable is the second thing that has a reference to the object. Obviously, none can be garbage-collected. The other is referenced by virtue of being assigned to the 'x' variable. One is referenced by the other as one of its properties. Unicode character class escape: \p // 2 objects are created.Character class escape: \d, \D, \w, \W, \s, \S.Enumerability and ownership of properties.
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