[ruby-core:93171] [Ruby trunk Feature#15927] Allow string keys to be used for String#% and sprintf methods
From:
duerst@...
Date:
2019-06-16 03:04:06 UTC
List:
ruby-core #93171
Issue #15927 has been updated by duerst (Martin Dst).
I agree with @sawa that there's a difference between gsub (where strings are replaced by strings) and sprintf, where it's interpolating something very close to variables.
A use case such as
```
"foo = %{foo}" % { 'foo' => 'bar' }
```
can just be rewritten to
```
"foo = %{foo}" % { foo: 'bar' }
```
Can you give us some actual use case(s) where such rewriting would not be possible, or very tedious?
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Feature #15927: Allow string keys to be used for String#% and sprintf methods
https://bugs.ruby-lang.org/issues/15927#change-78612
* Author: luke-gru (Luke Gruber)
* Status: Open
* Priority: Normal
* Assignee:
* Target version:
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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.
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