OpenEuphoria

Re: [tutorial] Basic Sequence Operations

• Posted by archeopteryx_08 Jan 27, 2019
• 1330 views

Speaking of basic sequence operations, on page 43 of the euphoria (4.1) pdf there is this code:

sequence s = {1,2,3} 
for i=0 to length(s)+1 do 
    ? insert(si, 99, i ) 
end for 
-- the output is 
-- {99,1,2,3} 
-- {99,1,2,3} -- same as prepend(s,99) 
-- {1,99,2,3} 
-- {1,2,99,3} 
-- {1,2,3,99} -- same as append(s,99) 

I understand what it's doing, but i can't help feel uncomfortable that insert() works when i=0, and that it gives the same value as when i=1. At (my) first sight, it appears visually to suggest that the inserted object (ie 99) should occupy s[0] (i know it doesn't!), then s[1] ... to s[4] - almost like a visual illusion. It isn't a big thing, but maybe insert() was designed to work this way; maybe it works well in real code ?

_Arch