Geoff Canyon wrote:
> At 1:59 PM +1200 8/8/01, Rodney Tamblyn wrote:
>> Instead of:
>>
>> repeat with x = 1 to the number of items in myVar
>>
>> ... could have:
>>
>> repeat with x in myVar by <delimiter>
>>
>> Advantages:
>> - simpler syntax
>> - consistent with syntax of other new commands in 2.4 like split
>>
>> Delimiters could be comma|word|return
>
> Sure, you can have that:
>
> --comma, assuming you haven't set the itemDelimiter property
> repeat for each item i in 1,2,3
>
> --word
> repeat for each word i in "MC Rocks Big Time"
>
> --return
> repeat for each line i in "Just one line, but you get the idea."
And boy oh boy! is the "repeat for each" so much faster than "repeat with".
"Repeat for each" parses the chunks for you and keeps its pointer into the
parsed data, as opposed to "repeat with", which counts through the data from
0 to i in each iteration.
And if you need a counter in the loop, I've found it's usually much faster
to keep your own counter in a "repeat for each" loop, even with the minor
additional overhead.
For example, this:
put 0 into tCounter
repeat for each line tLine in tData
add 1 to tCounter
put "processing line "&tCounter
DoSomethingWith tLine
end repeat
is faster than:
repeat with i = 1 to the number of lines of tData
put "processing line "&i
DoSomethingWith line i of tData
end repeat
You can run your own comparative tests to see the benefits yourself using
MetaBench:
<ftp://ftp.fourthworld.com/MetaCard/4W_MetaBench.mc.sit.hqx>
--
Richard Gaskin
Fourth World Media Corporation
Multimedia Design and Development for Mac, Windows, UNIX, and the Web
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