Feature #4234


Hash#default_proc= Doesn't Accept nil Argument

Added by runpaint (Run Paint Run Run) over 11 years ago. Updated about 10 years ago.

Target version:


The initial value of a Hash's default Proc is the block passed to or nil. Hash#default_proc= can set the default Proc to a given Proc, but can't reset it to nil. This is unsymmetrical.

The attached patch lets #default_proc= take a nil argument, and provides tests. This causes a RubySpec failure ("Hash#default_proc= raises an error if passed stuff not convertible to procs"), which I will fix if this patch is applied.


hash-default-proc.patch (973 Bytes) hash-default-proc.patch runpaint (Run Paint Run Run), 01/06/2011 01:11 AM
Actions #1

Updated by naruse (Yui NARUSE) almost 11 years ago

  • Status changed from Open to Assigned
  • Assignee set to akr (Akira Tanaka)
Actions #2

Updated by marcandre (Marc-Andre Lafortune) about 10 years ago

  • Tracker changed from Bug to Feature
  • Assignee changed from akr (Akira Tanaka) to matz (Yukihiro Matsumoto)
  • Priority changed from 3 to Normal

Changing this to 'feature'.

I'm in favor of this change, with a small change to the doc. The interface should be read:

hsh.default_proc = proc_obj or nil

I think it is indeed not clear how to clear a default_proc. See:


Updated by matz (Yukihiro Matsumoto) about 10 years ago

  • Assignee changed from matz (Yukihiro Matsumoto) to marcandre (Marc-Andre Lafortune)

Agreed. Marc, could you check this patch in (with document update)?


Actions #4

Updated by marcandre (Marc-Andre Lafortune) about 10 years ago

  • Status changed from Assigned to Closed
  • % Done changed from 0 to 100

This issue was solved with changeset r35268.
Run Paint, thank you for reporting this issue.
Your contribution to Ruby is greatly appreciated.
May Ruby be with you.

  • hash.c (rb_hash_set_default_proc): Accept nil, patch by Run Paint
    [Feature #4234]

  • test/ruby/test_hash.rb: test for above.


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