Where in the parsing rules does it say anything about awareness or non-awareness? How do you detect that amend-in-place has taken place? For example, if the code for doing amend-in-place were ripped out of the implementation, how are you going to know?
On Tue, Sep 9, 2014 at 9:51 AM, 'Pascal Jasmin' via Programming < programm...@jsoftware.com> wrote: > We understand the parsing rules as: > > a =: .... a > > to cause =: to have no awareness that 'a' was a part of the far off > expression to the right. > > > ----- Original Message ----- > From: Roger Hui <rogerhui.can...@gmail.com> > To: Programming forum <programm...@jsoftware.com> > Cc: > Sent: Tuesday, September 9, 2014 12:35 PM > Subject: Re: [Jprogramming] Replace one item of a list > > I don't believe the messages you cited explained it. J syntax consists of > word formation as defined by ;: and parsing rules as defined by Section IIE > of the dictionary. How is amend-in-place not permitted by either part? > > > > On Tue, Sep 9, 2014 at 8:56 AM, Dan Bron <j...@bron.us> wrote: > > > Ian wrote: > > > Then it actually does in-place updating (even though, > > > at face value, J syntax does not permit such a thing). > > > > Roger responded: > > > Please explain why this is not permitted by J syntax. > > > > I believe Ian is expressing a thought recently raised by Erling Hellenas > in > > [1], which I responded to here: > > > > http://www.jsoftware.com/pipermail/programming/2014-July/038030.html > > > > -Dan > > > > [1] "J and indexed replacement": > > > http://www.jsoftware.com/pipermail/programming/2014-July/038068.html > > > > "In most languages indexed replacement is indexed replacement? In J > > and > > in most functional languages it is not? You get a brand new > variable? > > So, why give the user the flawed impression he can still do indexed > > replacement and do amendments to variables/nouns? And at the same > > time > > in tacit code we pretend to only have functions? No variables/nouns > > to > > be amended? Just functional transformations?" > > > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > > > > > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
