[Swift-devel] loops and strings

[Veronika Nefedova]

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
>>
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>>
>