OpenEuphoria

RE: Standard Euphoria Library Project

• Posted by Al Getz <Xaxo at aol.com> Feb 07, 2001
• 414 views

Hi again Kat,

I did notice a few problems with the function:

  function remove( integer i, sequence s )
    -- remove ith element from s
    return s[1..i-1] & s[i+1..len]
  end function

For example, passing the null sequence (s="") will cause an
error.
The possible error situations are
  1. null sequence
  2. i<=0
  3. i>length of the sequence

It seems a little range checking would be worthwhile:

--improved 'remove()' function:

function remove( integer i, sequence s )
  -- remove ith element from s
  integer len

  len=length(s)
  if len>0 then      --handles null sequence
    if i>0 then      --handles i<=0
      if i>len then  --handles i greater then the length of the seq.
        return s
      else
        return s[1..i-1] & s[i+1..len]
      end if
    end if
  end if
  return ""
end function

This should take care of most problems associated with removing
specific elements of a sequence.

Good luck with it.
--Al