Scott Kane wrote:
----- Original Message ----- From: "J. Landman Gay"
<[EMAIL PROTECTED]>
I read somewhere a long time ago that switch statements run faster
than if/else. I think it was a general comment rather than
specifically related to Revolution programming but it was so long ago
I can't recall. Does anyone know if it is true for Rev scripts?
I haven't timed it - but if it's read by the engine in the same manner
other programming languages handle it then it would be faster as any
subsequent conditions are skipped because once the case statement
(switch statement) is met the compiler knows not to proceed - as opposed
to if/then/else etc where the entire handler is evaluated in full.
I remember reading that Rev doesn't evaluate the entire if/else, so I'd
think it would be about the same as switch. But lookee here, I did a
test, with surprising results:
on mouseUp
put 100000 into tRepeats
put the milliseconds into tstart
switchTest tRepeats
put the milliseconds - tstart into item 1 of tTimes
put the milliseconds into tstart
ifTest tRepeats
put the milliseconds - tstart into item 2 of tTimes
put tTimes
end mouseUp
on switchTest pRepeats
put 1 into tRep
repeat pRepeats
switch tRep
case tRep > 10000
put tRep into x
break
case tRep > 5000
put tRep into x
break
case tRep > 2000
put tRep into x
break
default
put tRep into x
end switch
add 1 to tRep
end repeat
end switchTest
on ifTest pRepeats
put 1 into tRep
repeat pRepeats
if tRep > 10000 then
put tRep into x
else if tRep > 5000 then
put tRep into x
else if tRep > 2000 then
put tRep into x
else
put tRep into x
end if
add 1 to tRep
end repeat
end ifTest
The "if/else" is 4 to 5 times faster. <blink> Is my test accurate?
--
Jacqueline Landman Gay | [EMAIL PROTECTED]
HyperActive Software | http://www.hyperactivesw.com
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