Wish List

[Steve Bouffe]

Create string of an array.

A$ = JOIN$( Array(), $CRLF)

Would be great is we could specify parameters to join a section of the array.

A$ = JOIN$( Array(10 to 20), $CRLF)

[Eros Olmi]

For me yes,

but only if both indexes are optional:

JOIN$( Array([IdxStart [TO IdxEnd]]) [, delim])

Regards
Eros

[Eros Olmi]

Anyhow, I think PB support would prefer an official request made at support at powerbasic dot com.
So better to send them a mail in any case regardless what will be the results of this poll.

[Michael Mattias]

Well, you should send in the NSF; it sounds pretty usable.

But this is the kind of situation where I just write my own function make sure it's includeable so I can re-use it. (Or if I'm in a good mood, post a demo here).

What comes to mind here is a header ...

FUNCTION JoinPartOfArray (s() AS STRING, delim AS STRING, _
          OPTIONAL startsub as LONG, OPTIONAL endsub AS LONG) AS STRING 

 code here

END FUNCTION

If endSub not passed use UBOUND.; if startsub not passed use LBOUND.

CALLS:

  S$ = JoinPartOfArray (foo(),"*", 5)  ' from subscript 5 to end using * 
  S$ = JoinPartOfArray (foo(), ",", 6, 32) ' from subs 5 to 32 only using comma
 S$ = JoinPartOfArray (foo(), "|")       ' whole array (= JOIN$) using pipe

Write once, use many

MCM

[John Gleason]

And in the meantime until that happy day...

#COMPILE EXE
#DIM ALL

'FUNCTION joPar() joins dynamic string arrays or parts of them
FUNCTION joPar(arr() AS STRING, a AS LONG, b AS LONG, delim AS STRING) AS STRING
   LOCAL x, y, lod AS LONG
   LOCAL jStr AS STRING

   x = STRPTR(arr(a))
   y = STRPTR(arr(b))
   IF (x AND y) = 0 THEN ? "Error, invalid array type or array element": EXIT FUNCTION

   lod = LEN(delim)
   jStr = SPACE$(y - x + LEN(arr(b)) + (b - a + 1) * lod) 'make big enough string to hold join
   x = 1

   FOR y = a TO b
      MID$(jStr, x) = arr(y)       'write an arr element
      x = x + LEN(arr(y))
      MID$(jStr, x) = delim        'join it
      x = x + lod
   NEXT
   FUNCTION = LEFT$(jStr, x - (lod + 1)) 'trim excess
END FUNCTION

'FUNCTION joParF() joins fixed string arrays or parts of them. String len needs to be specified each time used.
'In this example it is STRING * 100
FUNCTION joParF(arr() AS STRING * 100, a AS LONG, b AS LONG, delim AS STRING) AS STRING
   LOCAL x, y, lod AS LONG
   LOCAL jStr AS STRING

   x = VARPTR(arr(a))
   y = VARPTR(arr(b))
   IF (x AND y) = 0 THEN ? "Error, invalid array type or array element": EXIT FUNCTION

   lod = LEN(delim)
   jStr = SPACE$(y - x + LEN(arr(b)) + (b - a + 1) * lod)
   x = 1

   FOR y = a TO b
      MID$(jStr, x) = arr(y)
      x = x + LEN(arr(y))     '<< can replace w/ x = x + 100 (whatever fixed str len is) for efficiency
      MID$(jStr, x) = delim
      x = x + lod
   NEXT
   FUNCTION = LEFT$(jStr, x - (lod + 1))
END FUNCTION
             
              'join parts of arrays using functions joPar & joParF
FUNCTION PBMAIN () AS LONG
    LOCAL a AS STRING, ii AS LONG, ip AS LONG PTR, t AS SINGLE
    DIM strArr(5000) AS STRING
    DIM strArr2(5000) AS STRING * 100
    OPEN "c:\joPar1dTest.txt" FOR OUTPUT AS #1
    
    FOR ii = 0 TO 5000
       strArr(ii) = REPEAT$(ii, "ooo")
       strArr2(ii) = STR$(ii) & "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
    NEXT
    t = TIMER
                                                   
     PRINT #1, joPar (strArr(),  751, 1250, $CRLF)
     PRINT #1, joParF(strArr2(), 1954, 2004, $CRLF)
     
   ? "k" & STR$(TIMER - t)
END FUNCTION

[Michael Mattias]

>And in the meantime until that happy day...



Unless I have totally lost it, that's a totally different function from some kind of 'enhanced JOIN$'

[Michael Mattias]

Just for the record, you do not have to change the code to deal with fixed string arrays of varying element size.

You can use the technique demonstrated here... Single Function to process any array type (CC3/Win7+) 12-17-03

.. and use the ARRAYATTR function to query the size of the elements.

MCM

[Rodney Hicks]

Perhaps this is the reason that it is left the way it is. Each of us having a slightly different concept of how to go about it. I would have used a macro.
I'm not sure that any of us would be more 'right' in how we go about it.

Rod
PS
Poll could have used "Don't know" and/or "Don't care" as additional option(s).

[John Gleason]

>that's a totally different function from some kind of 'enhanced JOIN$'

Steve Bouffe wanted to do this:

A$ = JOIN$( Array(10 to 20), $CRLF)

and the code I posted does this:

a = joPar(Array(), 10, 20, $CRLF)

That is a correct way I believe to do it. I like the MACRO idea too.
____________________________________________

Single Function to process any array type...
.. and use the ARRAYATTR function to query the size of the elements.
MCM

Thanks for the tip! Never used it like that before.

[Michael Mattias]

When I saw the function header, all I saw was 'a' and 'b' but I was looking for something like "start" and "end" or "first" and "last."

You fooled me. Fooled me good.