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This relies on rails, the OP asked for a ruby solution
– dft
Commented Nov 13, 2017 at 23:42
3

That's right, although since a significant proportion of Ruby developers are using Rails, I thought this might be a preferred solution for some due to its clarity and brevity.
– stwr667
Commented Nov 15, 2017 at 1:53
1

See stackoverflow.com/a/4239625/128421. It's in Rails, but is easily accessed from regular Ruby using Rails' Active Support Core Extensions which allow easy cherry-picking of small groups of methods such as only in?.
– the Tin Man
Commented Feb 14, 2020 at 18:53
Correct @theTinMan. "cde".in? my_string in pure Ruby yields NoMethodError. But with require 'active_support/core_ext/object/inclusion' it works, which can be loaded either from Rails itself or from the cut-down Active Support Core Extensions.
– stwr667
Commented Feb 16, 2020 at 5:47

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