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

instance method

Object#nil?

obj.nil? → true or false

MJIT_FUNC_EXPORTED VALUE
rb_false(VALUE obj)
{
    return Qfalse;
}

Only the object nil responds true to nil?.

Example

Object.new.nil?   #=> false
nil.nil?          #=> true

See also #methods #object_id #method #private_methods also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.1