I've just run a regex against the cfdocs and I can't find any
reference to this new chaining functionality. This implies it's a new
and overlooked functionality. I wonder what else is un-noted.
Assignments in loop conditions has been around for a while. If it's a
CFLoop then you can only alter the loop operation with a condition. If
it's a loop within a script, you can use assignments at any time. It
allows for some 'silly' effects like this:
<CFSCRIPT>
For (i="M";i NEQ "P"; i=Chr(Asc(i)+1))
writeoutput(i&' ');
</CFSCRIPT>
On Mon, Mar 1, 2010 at 4:40 PM, Barney Boisvert <[email protected]> wrote:
>
> A quick test indicates it's new in CF9. Worth mentioning that it is
> NOT treating the assignment as an expression, it is only allowing
> multiple variables to be assigned to a single expression. Your second
> test case would fail regardless of which one CF was doing, but this
> example also fails (meaning it's the latter):
>
> <cfset c=(b=a+1)+1>
>
> You can also use assignments in loop conditions. I think Ben blogged
> about that last summer.
>
> cheers,
> barneyb
>
> On Mon, Mar 1, 2010 at 1:33 PM, Michael Dinowitz
> <[email protected]> wrote:
>>
>> I think that I missed this in the docs. It seems that you can chain
>> set variables
>>
>> <cfset a=1>
>> <cfset c=b=a+1>
>>
>> This will give you a=1, b=2, c=2.
>>
>> On a related note, the following will fail
>>
>> <cfset a=1>
>> <cfset c=b+1=a+1>
>>
>> The chain works as long as there is no operation except on the
>> right-most item in the chain.
>>
>> This is all expected behavior in some other languages but I've never
>> seen it in CF. Anyone know when it was added?
>>
>> Please make me look like a fool for missing it. :)
>>
>> --
>> Michael Dinowitz
>>
>
>
>
> --
> Barney Boisvert
> [email protected]
> http://www.barneyb.com/
>
>
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