Instance Method

subtract(_:)

Removes the elements of the given set from this set.

Declaration

mutating func subtract(_ other: DispatchSource.MachSendEvent)

Parameters

other

A set of the same type as the current set.

Discussion

In the following example, the elements of the employees set that are also members of the neighbors set are removed. In particular, the names "Bethany" and "Eric" are removed from employees.

var employees: Set = ["Alicia", "Bethany", "Chris", "Diana", "Eric"]
let neighbors: Set = ["Bethany", "Eric", "Forlani", "Greta"]
employees.subtract(neighbors)
print(employees)
// Prints "["Diana", "Chris", "Alicia"]"