How in Ruby from two arrays it is possible to display non-matching values?

Question

Ruby on Rails

I can't solve this problem at all.
The fact is that, for example, there are arrays:

list = [101,102,103,104,105]
list2 = [101,102,103]

I want to compare these arrays and display non-matching values, i.e. those values ​​that are in list, but not in list2, in our case it is 104, 105.
How can this be done?

Answer 1

list = [101,102,103,104,105]
=> [101, 102, 103, 104, 105]
list2 = [101,102,103]
=> [101, 102, 103]
(list-list2) | (list2-list)
=> [104, 105]

Answer 2

lmgtfy:
ruby-doc.org/core-2.2.0/Array.html#2D-method
grosser.it/2011/07/07/ruby-array-diffother-differe...
stackoverflow.com/questions/80091/diff -a-ruby-stri...