[Swift-devel] loops and strings

[Mihael Hategan]

wham_string2 = @strcat(wham_string, ", wham");
print(wham_string2);

Variables are not variables. They are labels that are used to direct the
data flow. Loops (in the sense of data looping around the same node -
picture this as a data flow graph) make no sense.

On Fri, 2007-07-27 at 10:50 -0500, Veronika Nefedova wrote:
> So how else then I construct a string in swift ?
> 
> 
> On Jul 27, 2007, at 10:46 AM, Mihael Hategan wrote:
> 
> > Variables in swift are single assignment. You can't assign to a  
> > variable
> > twice. What, in your opinion, should the error message be instead  
> > of the
> > current one?
> >
> > On Fri, 2007-07-27 at 10:22 -0500, Veronika Nefedova wrote:
> >> I am not sure if its possible to do string operations inside the loop
> >> in swift?
> >> I have a versy simple test code that doesn't work no matter what.
> >> Obviously, I am missing something.
> >> This is the code:
> >>
> >> file fls[]<filesys_mapper;pattern="*.prt",location=".">;
> >> string wham_string = "#";
> >> foreach prt_file in fls
> >> {
> >>        wham_string = @strcat (wham_string, ", wham");
> >>        print (wham_string);
> >> }
> >> print (wham_string);
> >>
> >>
> >> basically I expect to have this as an output:
> >> #,wham,wham,wham,wham,... (its a test code (-;)
> >>
> >> instead I have these errors:
> >>
> >> wham_string is already assigned with a value of #
> >> wham_string is already assigned with a value of #
> >>          vdl:assign @ test.kml, line: 46
> >>          vdl:mains @ test.kml, line: 39
> >> Caused by: java.lang.IllegalArgumentException: wham_string is already
> >> assigned with a value of #
> >>          at org.griphyn.vdl.mapping.AbstractDataNode.setValue
> >> (AbstractDataNode.java:255)
> >>          at org.griphyn.vdl.karajan.lib.Assign.function 
> >> (Assign.java:70)
> >> <snip>
> >>
> >>
> >> In any case -- if I can't construct the string by using the loop -
> >> how else could it be done?
> >>
> >> I use the constructed string then to map an array (I understand I
> >> can't map individual array elements):
> >>
> >> file whamfiles_$s[] <fixed_array_mapper;files="$wham_string">; //it
> >> was in the wrapper script before)
> >>
> >>
> >> Nika
> >>
> >> _______________________________________________
> >> Swift-devel mailing list
> >> Swift-devel at ci.uchicago.edu
> >> http://mail.ci.uchicago.edu/mailman/listinfo/swift-devel
> >>
> >
>