1. More Wish List
Here's a wish for the 'while' and 'for' loops:
[for loop]
for <var> = <start> to <end> [by <step>] do
[exit]
[continue]
[else
<statements>]
end for
[while loop]
while <test> do
<statements>
[exit]
[continue]
[else
<statements>]
end while
[continue]
This instruction causes the code to jump to the top of the loop. It's
standard with most languages, and always puzzled me that Euphoria hasn't got
one yet.
[else]
I found this one in Python, and it's pretty cool. If the loop is exited
*without* encountering an 'exit' statement, the 'else' branch is taken. So
instead of having to write this sort of thing to handle exceptions:
integer found
found = False
for i = 1 to length( s ) do
... code goes here ...
if test then
flag = True
exit
end if
end for
if not found then
... exception processing ...
end if
you could use the 'else' to handle the exception:
for i = 1 to length( s ) do
... code goes here ...
if test then
exit
end if
else
... exception processing ...
end for
It not only makes the code shorter, but it binds the exception code to the
loop construct, which is where it logically belongs.
-- David Cuny
2. Re: More Wish List
Derek Parnell wrote:
> for i = 1 to length( s ) do
> ... code goes here ...
> if test1 then
> exit code1
> end if
> ... more code can go here ...
> if test2 then
> exit code2
> end if
> ... more code can go here ...
> when code1
> exception processing ...
> when code2
> exception processing ...
> end for
I'm not entirely clear what's happening here. If the intent is to allow the
user to jump to the bottom of the loop, run the exception processing, and
exit, this will accomplish the same thing, with no new construct and the
same amount of code.
for i = 1 to length( s ) do
... code goes here ...
if test1 then
code1 exception processing
exit
end if
... more code can go here ...
if test2 then
code2 exception processing
end if
... more code can go here ...
end for
Am I missing something?
-- David Cuny
3. Re: More Wish List
Derek Parnell wrote:
> How about ...
OK, I'm clear on it now.
-- David Cuny
