Issue #3450 has been updated by nahi.

Description updated
Assignee set to nobu


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Feature #3450: Format Strings with Named Arguments & Hash#default
https://bugs.ruby-lang.org/issues/3450#change-24726

Author: runpaint
Status: Open
Priority: Low
Assignee: nobu
Category: core
Target version: 2.0.0


=begin
 Is it intentional that the, undocumented, feature #442 (named arguments in format strings) ignores the Hash's default value? 
 
   >> hash = {greeting: 'Hello'}.tap{|h| h.default = 'World'}
   >> '%{greeting}, %{greeted}' % hash
   #=> KeyError: key{greeted} not found
 
 It's quite common for templates to use default values. In interface localisation, untranslated strings may need to be substituted for the equivalent in the native language, or replaced with a generic string in the target language. When building reports with format strings, a default value of an empty string allows unexpanded format sequences to be non-fatal. In both cases, a default proc would provide even further flexibility.
 
 Another perspective is that this behavior unnecessarily breaks the abstraction that default values are just like any other.
=end



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