NilClass

The class of the singleton object nil.

Several of its methods act as operators:

• &

• |

• ===

• =~

• ^

Others act as converters, carrying the concept of nullity to other classes:

• rationalize

• to_a

• to_c

• to_h

• to_r

• to_s

While nil doesn’t have an explicitly defined to_hash method, it can be used in ** unpacking, not adding any keyword arguments.

Another method provides inspection:

• inspect

Finally, there is this query method:

• nil?