[Patches] [ python-Patches-1410119 ] Add foldr and foldl to functional module

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Patches item #1410119, was opened at 2006-01-19 13:50
Message generated for change (Comment added) made by jimjjewett
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Category: Modules
Group: Python 2.5
Status: Open
Resolution: None
Priority: 5
Submitted By: Collin Winter (collinwinter)
Assigned to: Nobody/Anonymous (nobody)
Summary: Add foldr and foldl to functional module

Initial Comment:
This patch adds foldr and foldl functions to the
functional module. In addition, it updates
libfunctional.tex and test/test_functional to include
documentation and tests, respectively, for the new
code. The code has been checked for reference leaks
using --with-pydebug.

The patch is against svn revision 42097.

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Comment By: Jim Jewett (jimjjewett)
Date: 2006-01-20 10:32

Message:
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What does this add over the (currently builtin) reduce?  

reduce(func, iter, initial)

and

reduce(func, reversed(iter), initial)

Is it just that foldr and foldl are more modern names?  
If so, it might be better to submit a documentation patch.  
The functional module should mention reduce, and the reduce 
documenation (library reference/Built-in Objects/Built-in 
Functions) could be clarified.  

Maybe even show how to create foldr and foldl as an example, 
for reduce so that the terms can be picked up by indexers.



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