Switch or If

[Phil Davis]

Hi Camm,

Unless you're building something where the small difference in speed is 
absolutely critical, I would seek to answer a different question:  Which 
structure will be easier to understand and maintain in the future when I 
(or others) come back to it?

My 2 cents' worth -
Phil Davis


Mark Smith wrote:
>
> On 23 Apr 2009, at 11:02, <camm29 at tesco.net> <camm29 at tesco.net> wrote:
>
>> All ,
>>
>> Which is faster in a loop ?
>>
>> SWITCH or IF
>>
>>
>
> This is a little test I did. I get about 35ms for 'switch', about 20ms 
> for 'if'. As Jim said though, I suspect it'll vary according to the 
> kind and complexity of conditions you're testing.
>
>
> on mouseUp
>    put the millisecs into tStart
>    repeat 10000
>       put random(5) into tSw
>       switchTest tSw
>    end repeat
>    put the millisecs - tStart into t1
>
>    put the millisecs into tStart
>    repeat 10000
>       put random(5) into tIf
>       ifTest tIf
>    end repeat
>    put the millisecs - tStart into t2
>
>    put t1 && t2
> end mouseUp
>
> -----
>
> on switchTest pSw
>    switch pSw
>       case 1
>
>          break
>       case 2
>
>          break
>       case 3
>
>          break
>       case 4
>
>          break
>       default
>
>          break
>    end switch
> end switchTest
>
> -----
>
> on ifTest pIf
>    if pIf = 1 then
>
>    else if pIf = 2 then
>
>    else if pIf = 3 then
>
>    else if pIf = 4 then
>
>    else
>
>    end if
> end ifTest
>
> Best,
>
> Mark
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-- 
Phil Davis

PDS Labs
Professional Software Development
http://pdslabs.net