Re: else ladders practice

On 06.11.2024 00:01, Bart wrote:

 
Well, it started off as 2-way select, meaning constructs like this:
 
   x = c ? a : b;
   x := (c | a | b)
 
Where one of two branches is evaluated. I extended the latter to N-way
select:
 
   x := (n | a, b, c, ... | z)
 
Where again one of these elements is evaluated, selected by n (here
having the values of 1, 2, 3, ... compared with true, false above, but
there need to be at least 2 elements inside |...| to distinguish them).

I suppose you borrowed that syntax from Algol 68, or is that just
coincidence?

Algol 68's 'CASE' statement has the abbreviated form you depicted
above. (There's also some nesting supported with the '|:' operator,
similar to the 'IF' syntax [in Algol 68].) - Personally, though,
I use that only very rarely because of the restriction to support
only integral numbers as branch selector.

 
I applied it also to other statements that can be provide values, such
as if-elsif chains and switch, but there the selection might be
different (eg. a series of tests are done sequentially until a true one).
 
I don't know how it got turned into 'multi-way'.
 
[...]

Janis