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

instance method

Range#to_set

() -> ::Set[E]

[T] () { (E) -> T } -> ::Set[T]

to_set → set

static VALUE
range_to_set(VALUE range)
{
    if (NIL_P(RANGE_END(range))) {
        rb_raise(rb_eRangeError, "cannot convert endless range to a set");
    }
    return rb_call_super(0, NULL);
}

Returns a set containing the elements in self, if a finite collection; raises an exception otherwise.

Example

(1..4).to_set   # => Set[1, 2, 3, 4]
(1...4).to_set   # => Set[1, 2, 3]

(1..).to_set
# in 'Range#to_set': cannot convert endless range to a set (RangeError)

Ruby version changes

4.1
- A deprecated behavior, Set#to_set, Range#to_set, and Enumerable#to_set accepting arguments, was removed. [Feature #21390]
4.0
- Range#to_set now performs size checks to prevent issues with endless ranges. [Bug #21654]