instance method

Range#to_set

() -> ::Set[Elem]

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

to_set → set

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

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

4.0
- Range#to_set now performs size checks to prevent issues with endless ranges. [Bug #21654]