Re: How best to extract digits from a string?
Re: How best to extract digits from a string?
- Subject: Re: How best to extract digits from a string?
- From: Paul Berkowitz <email@hidden>
- Date: Thu, 26 Apr 2001 08:31:40 -0700
On 4/26/01 3:14 AM, "Bill Cheeseman" <email@hidden> wrote:
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on 4/25/01 11:46 PM, Paul Berkowitz at email@hidden wrote:
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> repeat with i from 1 to (count input)
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> set char to character i of input
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> if char is in digits then set end of output to char
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> end repeat
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Do you say this is better than concatenating strings on the basis of testing
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or theory?
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I understand that the "end of" syntax was provided as a speedier way of
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building lists than concatenating them. (The old AppleScript 1.1 release
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notes regarding the differences between linked lists and vector lists make
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fascinating if difficult reading.)
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But I don't know anything about how strings are implemented under the hood,
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and I wonder whether the list approach in general is faster or slower than
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concatenating strings.
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I've seen really dramatic differences with enormous text operations. But it
was far too long ago in scripts I only dimly recall to be able to check now
as to whether there were other circumstances which caused these differences.
So this counts more as "folk memory" (i.e. could be hogwash) rather than
rigorous testing. I'll do some of the latter at the next real opportunity.
Perhaps others will chime in here.
--
Paul Berkowitz