Enumerator Class

TODO

[53] pry(main)> [1,2,3].each

=> #<Enumerator: ...>

[54] pry(main)> [1,2,3].map

=> #<Enumerator: ...>

[55] pry(main)> [1,2,3].reduce

LocalJumpError: no block given

from (pry):65:in `each'