Issue #5558 has been reported by Thomas Sawyer.

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Feature #5558: String#% strange arity errors
http://redmine.ruby-lang.org/issues/5558

Author: Thomas Sawyer
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 


When the number of arguments do not match the number of % parameters, the String#% method has some odd behavior.

When too many, it seems to work fine, ignoring the extra arguments.

  "%s" % [1,2]  #=> "1"

But if `$DEBUG = true`,

  "%s" % [1,2]  #=> ArgumentError: too many arguments for format string

That doesn't seem right. Is it an error or isn't it?

For too few arguments it is always an error:

  "%s" % []   #=> ArgumentError: too few arguments

Personally, I think it should use '' for missing arguments. That would make it more flexible in practice.

I consider the first $DEBUG issue a bug, and the later a feature. But I'll just call it a feature altogether to make things easier.



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