End of Life Ruby 3.0 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

Integer#integer?

int.integer? → true

# File tmp/rubies/ruby-3.0.5/integer.rb, line 91
def integer?
  return true
end

Since int is already an Integer, this always returns true.

See also #inspect #lcm #gcdlcm #magnitude also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.1