Set#-

(::_Each[A]) -> self

-(enum)

# File tmp/rubies/ruby-3.4.1/lib/set.rb, line 633
def -(enum)
  dup.subtract(enum)
end

Returns a new set built by duplicating the set, removing every element that appears in the given enumerable object.

Example

Set[1, 3, 5] - Set[1, 5]                #=> #<Set: {3}>
Set['a', 'b', 'z'] - ['a', 'c']         #=> #<Set: {"b", "z"}>

See also #+ #< #& #<< also in 4.1 · 4.0 · 3.3 · 3.2 · 3.1 · 3.0