Method: Range#===

Defined in:

range.c

#===(object) ⇒ Boolean

Returns true if object is between self.begin and self.end. false otherwise:

(1..4) === 2       # => true
(1..4) === 5       # => false
(1..4) === 'a'     # => false
(1..4) === 4       # => true
(1...4) === 4      # => false
('a'..'d') === 'c' # => true
('a'..'d') === 'e' # => false

A case statement uses method ===, and so:

case 79
when (1..50)
  "low"
when (51..75)
  "medium"
when (76..100)
  "high"
end # => "high"

case "2.6.5"
when ..."2.4"
  "EOL"
when "2.4"..."2.5"
  "maintenance"
when "2.5"..."3.0"
  "stable"
when "3.1"..
  "upcoming"
end # => "stable"

Returns:

• (Boolean)

# File 'range.c', line 2036

static VALUE
range_eqq(VALUE range, VALUE val)
{
    return r_cover_p(range, RANGE_BEG(range), RANGE_END(range), val);
}