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Re: Chained-functional notation examples?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg132696] Re: Chained-functional notation examples?
  • From: Unknown <dog at gmail.com>
  • Date: Wed, 7 May 2014 02:44:43 -0400 (EDT)
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On Tue, 06 May 2014 06:26:46 +0000, Unknown wrote:

> I came to 'Mathematica' via Xahlee's criticism of the ad-hoc nature of
> unix-piping [functional notation].  He claims [& I believe him] that
> Mathematica has a better, more consistent notation.  But the facility of
> PRE, IN & POST-fix alternatives, seems bad.  You want ONE way of
> acieving the goal. More rules just increases mental load.
> 
> A major benefit of functional [unix-piping] programming style, is that
> you don't need to remember the-full-journey: you just need to remember
> the previous stage's output. Nor do you need to remember several names:
> the previous output is just "it".  A superficial read through a recent
> article[s] here, about <collecting data from several servers, and
> agregating it, and sending the result to a master> seemed very
> interesting, and matches my ideas of using functional programming.  But
> I can't afford to invest in ANOTHER notation/syntax, without good
> prospect of productivety increase.
> 
> Just as a test, how would Mathematica handle the following [or part of]
> little task:
> 
> search all files in Dir=tree D |
>  which are less than N days-old |
>  and which contain string S1 |
>  and which contain string S2 .
> 
> Actually, this seems not a good example, since it's biased towards the
> *nix file system's format/syntax.
> 
> Try:
> Search in table of ListOfOpenFiles for lineS with path-P [field] |
>  which have same tty-field as line with path-P2 & program-M [field]
> 
> This sounds like a data-base problem?
> 
> Or is there a nice list of 'such' Mathematica examples?
> 
>  Thanks,
> 
> == John Grant.

Here's a related real-live problem:
 list all files in Dir-tree:D |
 which are less-than daysOld:N |
 and contain "egal" in the FullPathName |
  and contain String:"uid" OR "UID"



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