Groups > comp.soft-sys.math.mathematica > #2889

Re: Mapping to Create Nested Loops

From	Szabolcs Horvát <szhorvat@gmail.com>
Newsgroups	comp.soft-sys.math.mathematica
Subject	Re: Mapping to Create Nested Loops
Date	2011-06-02 11:16 +0000
Organization	Steven M. Christensen and Associates, Inc and MathTensor, Inc.
Message-ID	<is7rdh$rf9$1@smc.vnet.net> (permalink)
References	<is57n9$dgk$1@smc.vnet.net>

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On 2011.06.01. 13:27, Bob Hanlon wrote:
> GatherBy[myArray, #[[3]]&]
>
> GatherBy[#, #[[3]]&]&  /@ myListOfArrays
>
>

Is this kind of use of nested functions with # guaranteed to be safe 
(let's disregard readability concerns for now)?

It appears that # indeed is always the argument of the innermost 
function, but I couldn't find this stated in the docs.  Instead, it's 
suggested in the docs (page for Slot) to use named arguments with nested 
functions (but those aren't without name-conflict / localization issues 
either)

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Re: Mapping to Create Nested Loops Bob Hanlon <hanlonr@cox.net> - 2011-06-01 11:27 +0000
  Re: Mapping to Create Nested Loops Szabolcs Horvát <szhorvat@gmail.com> - 2011-06-02 11:16 +0000

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