Hi Mark,
On Mac pro OS X 10.4.8 (2.16 GHz Intel Core Duo)
I get :
for "if then else" : 95-96 milliseconds
for "switch" : 12-13 milliseconds
Best regards from Grenoble
André
Le 3 nov. 06 à 20:14, Mark Smith a écrit :
Kay, I meant to check this out when I saw your post, but it's taken
me a little time to get to it. I'm pretty sure that for multiple
choice situations, a switch structure seems more efficient (ie.
faster) than an equivalent multi-way if-then-else structure.
I'd be interested to see if you get similar results to mine if you
paste the following into a button:
on mouseUp
repeat 100000
put random(6) & cr after rList
end repeat
put the millisecs into st
repeat for each line L in rList
if L = 1 then
get 1
else if L = 2 then
get 2
else if L = 3 then
get 3
else if L = 4 then
get 4
else if L = 5 then
get 5
else if L = 6 then
get 6
end if
-- switch L
-- case 1
-- get 1
-- break
-- case 2
-- get 2
-- break
-- case 3
-- get 3
-- break
-- case 4
-- get 4
-- break
-- case 5
-- get 5
-- break
-- case 6
-- get 6
-- break
-- end switch
end repeat
put the millisecs - st
end mouseUp
When I do this, (Mac 1.5Mhz G4 laptop), the if-then-else version
takes 180-ish milliseconds, whereas the switch-case version takes
70-ish ms.
Admittedly, this isn't the difference between unusably slow and
blisteringly fast, but it's always worth knowing your options....
Best,
Mark
On 31 Oct 2006, at 11:22, Kay C Lan wrote:
I've come into this a little late, no internet for a week or so, but
be aware that switch is slower than if-then-else-end if, no matter
who
many nested ifs are required to do 'the same' as a mult-case switch
statement. It's only a couple of milliseconds over 1000 executions,
but it is slower.
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