ruby - Rails check if an array exists -

sorry noobish question; started developing rails. checked through api, documentation, , did bunch of searches not find for.

is there method check see if specific array exists?

for example,

    array = []     array = [2,3,4]     if array.exists?       puts "array exists!"     else       puts "no such thing!"     end

thanks

like so:

if defined?(array)

instance variables (eg @array) default nil, can test them

if @array

Script