Preview Ruby 4.1 is a preview. It can change before the final release. Switch to Ruby 4.0 →

instance method

Set#union

(::_Each[A]) -> self

union(p1)

static VALUE
set_i_union(VALUE set, VALUE other)
{
    set = rb_obj_dup(set);
    set_merge_enum_into(set, other);
    return set;
}

Alias of #|

Returns a new set containing the union of self and the given enumerable; that is, containing the elements of both self and enumerable.

Example

set = Set[0, 1, 2]
set | Set[2, 1, 'a'] # => Set[0, 1, 2, "a"]
set | set            # => Set[0, 1, 2]

See also #| #to_set #to_s also in 4.0 · 3.4 · 3.3 · 3.2 · 3.1 · 3.0