gistfile1.md

ド・モルガンの法則で条件式を明瞭にする

def allow_access_to_site?
  ! (signed_out? && untrusted_ip?)
end

One:

!(a && b) == !a || !b

Two:

!(a || b) == !a && !b

! (signed_out? && untrusted_ip?)
(! signed_out?) || (! untrusted_ip?)

• Clearer Conditionals using De Morgan's Laws
• ド・モルガンの法則 - Wikipedia