Issue #15927 has been updated by luke-gru (Luke Gruber). This can be closed as I agree with the feedback given. Thanks! ---------------------------------------- Feature #15927: Allow string keys to be used for String#% and sprintf methods https://bugs.ruby-lang.org/issues/15927#change-106008 * Author: luke-gru (Luke Gruber) * Status: Open * Priority: Normal ---------------------------------------- Right now, in the methods sprintf() and String#%, only symbol keys can be used for named interpolation. For example (from the example documentation): "foo = %{foo}" % { :foo => 'bar' } #=> "foo = bar" String keys do not work like this: "foo = %{foo}" % { 'foo' => 'bar' } #=> raises KeyError I think string keys should work just the same as symbol keys here. I've created a PR on github for this, perhaps misguidedly, but if can be found here: https://github.com/ruby/ruby/pull/2238 My argument for this feature is that String#gsub() and family works with string keys if given a Hash, for example: "chocolate ice cream".gsub(/\bc/, { 'c' => 'C' }) #=> 'Chocolate ice Cream' Also, I don't like having to symbolize keys in strings unnecessarily, but maybe that just goes back to when Ruby couldn't GC some symbols. -- https://bugs.ruby-lang.org/