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1 point by thaddeus 5851 days ago | link | parent

I've have to check the code at home, at work now.....

Essentially I'm taking a spreadsheet file (csv) with an arbitrary number of columns of data, reading in the headers so they can be output to the html table as headers then reading in the remainder to create rows in the html table.

also also letting users to pick and choose which columns of data they want by selecting header names.

I've pretty much got it all working, I'm just surprised the language wouldn't provide for passing in results of an iteration function cleanly. To have to create an extra function simply to strip out the nil ends up making the code readability poor..... I'm sure I will look at the code in 2 months, scratch my head and ask why I needed a second function.... of course by then I'll probably have found a better way :)



1 point by rincewind 5851 days ago | link

  (def keep-cols (cols tabl) ;for one row
     (map [let nr -1 (keep [some (++ nr) cols] _)] tabl))

  (def get-cols (cols tabl) ;table with selected columns
      (withs ((head . rows) tabl
              colnrs (rem nil (map [pos _ head] cols))
              filtered-rows (keep-cols colnrs rows))
        (cons cols filtered-rows)))

  ;test
  (get-cols '(foo baz) '((foo bar baz) ;header
                         (bla bla spam)
                         (eggs ham bacon) 
                         (lorem ipsum test)))

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1 point by thaddeus 5850 days ago | link

That's much nicer code than mine :)

I'm going to step through some of the syntax; I haven't been using: map, [], or "." yet.

Thanks, T.

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