Ruby unless && statement (unless or and, Ruby Draft)

index.rb

a = true
b = false

# if one of variable false run exception

if !a or !b
  p 'ERROR 1' # +
end

unless a or b
  p 'ERROR 2' # -
end

unless a and b
  p 'ERROR 3' # +
end

# Screenshot: https://dl.dropboxusercontent.com/s/nsfx4h8k3318ota/Screenshot%20at%2012-28-36.png

# Ruby first evaluates the values of both variables and then checks whether FALSE
unless (false)
  p 'ERROR'
end

# TRUE if all variables is true
> true and false
 => false 

# TRUE if at least one of variables is true
> true or false
 => true