Ruby "include?" outputting false when element appears to be in array

Question

I am writing a simple program to filter out stock quotes from a given string via a regex. I am not having a problem with the printed results in the array but when I attempt to use "include?" to output a bool of a specific printed result, I am receiving false.

This code demonstrates my exact issue:

http://ideone.com/JiQlA

I have shown the matches, the # of elements, and verified it is an array in the code but when I try to pull the specific printed element "A" using "include?" (line 10), it fails to output "true."

I would very much appreciate if someone would kindly explain my error here or how I would appropriately go about finding if a specific element is in the array. Thank you.

Amadan · Accepted Answer · 2012-06-17 19:30:18Z

8

The elements in your Array are not Strings, they're MatchData which happen to print as Strings. Since String "A" is not equal to #<MatchData "A" 1:nil>, include? fails.

answered Jun 17, 2012 at 19:30

Amadan

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qdiesel · Accepted Answer · 2012-06-17 19:30:14Z

5

puts matches.map{|x| x.to_s}.include?("A")

answered Jun 17, 2012 at 19:30

qdiesel

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2 Comments

qdiesel Over a year ago

and to see what your error was, replace puts matches with puts matches.inspect

Sergio Tulentsev Over a year ago

There's a shorter way: matches.map(&:to_s).include?('A')

You · Accepted Answer · 2012-06-17 19:31:52Z

1

Because matches is an array of MatchData objects, as seen here. You need to convert the elements to strings first, so do that in your map call:

matches = s.to_enum(:scan, r).map { Regexp.last_match.to_s }

answered Jun 17, 2012 at 19:31

You

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