[REBOL] Re: Fast way to strip characters
From: compkarori:gma:il at: 7-Oct-2009 1:07
Peter
Trim modifies the string in situ.
Your trim code only does it once but parse is working 10,000 x.
On Wed, Oct 7, 2009 at 6:51 PM, Peter Wood <pwawood-gmail.com> wrote:
> 2009/10/7 Izkata <izkata-gmail.com>
>
>>
>> If all you're doing is stripping characters, I suggest 'trim -
>>
>> >> trim/with {I'm so not here} {' }
>> == "Imsonothere"
>>
>> Is parse faster in this case?
>>
>>
> Trim is much faster than parse for your example. It is a native function.
> speedtest: func [][
> =A0 =A0st: now/precise
> =A0 =A0loop 10000 [stripped: trim/with teststring "' "]
> =A0 =A0et: now/precise
> =A0 =A0print ["10000 trim/with took:" difference et st]
> =A0 =A0st: now/precise
> =A0 =A0strip: charset [#" " #"'"]
> =A0 =A0not-strip: complement strip
> =A0 =A0loop 10000 [
> =A0 =A0 =A0 =A0stripped: copy ""
> =A0 =A0 =A0 =A0parse teststring [any [copy str some not-strip (insert tail stripped
> str) | some strip]]
> =A0 =A0]
> =A0 =A0et: now/precise
> =A0 =A0print ["10000 parse took:" difference et st]
> ]
>
>>> speedtest
> 10000 trim/with took: 0:00:00.007205
> 10000 parse took: 0:00:00.05729
>
> Regards
> Peter
>
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