Question

I am working with the “any?” method in a block. The snippet is looking for the string “CA” in the string (split) check:

region="CA"
check="AU,US,UK,CA,ZA"
if check.split(',').any? { |r| region[r] }
  puts "This is true!"
end

I know how the “any?” command works what i don’t get is why region[r] resolves to true when the r value is “CA” – so we have region[“CA”] giving us true!

I can see that “CA”[“CA”] is true but why? There is a little knowledge I am missing here.

Answer 1

From String methods [] and slice,
http://www.ruby-doc.org/core-1.9.2/String.html#method-i-5B-5D

    str[other_str] → new_str or nil
    str.slice(other_str) → new_str or nil

If a String is given, that string is returned if it occurs in str.