Question

Possible Duplicate:
Elegant chained 'or's for tests on same variable in Ruby

I am using Ruby on Rails 3.2.2 and I would like to know if there are shorter ways to perform same checks as in the following:

if (variable == 'A') or (variable == 'B')
  ...
end

if (variable == 'A') or (variable == 'B') or ... or (variable == 'Z')
  ...
end

Note that I have to repeat statements related to the variable == “part” more than once and one time for each check. I would not repeat that “part” and make things shorter. Is it possible in Ruby/Ruby on Rails? If so, how can I make that?

Answer 1

Here’s one way:

if %w[A B C].include? variable

or if you have an actual range of values:

if ('A'..'Z').include? variable