klyn.collections.HashSet.difference
method
public difference(other as HashSet<T>) as HashSet<T>:
Description

Returns a new set containing elements from this set that are absent from other.

Parameters
ParameterDescription
otherElements to remove from the copy.
Returns

A new hash set containing the difference.

Example
import klyn.collections

remaining = {1, 2, 3}.difference({2})
assert remaining.size == 2
assert 2 not in remaining