OpenEuphoria

1. find_diff

• Posted by "Cuny, David at DSS" <David.Cuny at DSS.CA.GOV> Feb 18, 2000
• 553 views

Here's a routine I've found useful:

   function find_diff( object o, sequence s )
      for i = 1 to length( s ) do
         if equal( s[i], o ) then
            return i
         end if
      end for
      return 0
   end function

With find(), you can ask if an item is in a list. With find_diff(), you can
ask if something other than an item is in a list. For example:

   find_diff( -1, list )

returns the index of the first item in the sequence that isn't -1. This is
NOT the same as:

   not find( -1, list )

if the data in the list is not binary. For example, I have a listing of
timings where zero indicates a timer is ready, -1 indicates that it's been
fired, and a positive number indicates that there is time remaining:

   { 0, -1, 23, 33 }

with find_diff, I can ask if there are any timers not in a particular state.

-- David Cuny