if VARIABLE in ARRAY ruby

Question

I thought this should work:

def setMethod(method)
  if method in @@methods
    ... do something
  end
end

But I keep getting keyword error for in

You get an error because that's not how you check inclusion in Ruby. The error message is telling you true: there is no keyword in in Ruby. Use @@methods.include? method instead. See, for example, stackoverflow.com/questions/1986386/…. Sometimes the way we expect a language should work isn't the way it works. ;) — lurker
– lurker, Commented Sep 8, 2014 at 16:16
Awesome, thanks! I was just looking at python code and converting it to ruby and coffeescript has the in keyword and claims to try to 'give ease to ruby developers who want to write coffeescript' — Mohamed El Mahallawy
– Mohamed El Mahallawy, Commented Sep 8, 2014 at 16:22
Interesting. Yeah, that's probably a little misleading on their part. — lurker
– lurker, Commented Sep 8, 2014 at 16:24
Ruby does have an in keyword that can be used for for loops, but it is hardly used. — David Grayson
– David Grayson, Commented Sep 8, 2014 at 16:30

David Grayson · Accepted Answer · 2014-09-08 16:32:12Z

3

Try this, assuming @@methods is an array:

if @@methods.include?(method)
  # ...
end

answered Sep 8, 2014 at 16:32

David Grayson

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2 Comments

The question wasn't clear but they might have wanted this... for method in @@methods or better yet @@methods.each do |method|

No it's an if statement just like with python