I've recently learned of a programming requirement, based on the
"fact" that the ColdFusion engine must actually traverse an array - each
time our code requests it's length.
The requirement was that the length of arrays be determined once at the
start (of a method, let's say) and set to a variable instead of calling
arrayLen() over & over again. This would result in less processor usage.
Picture a x=1; x<array.length; x++ loop. Each time one looped through
the array, CF allegedly had to count the array - with each iteration of
the loop - in which x<array.length was in the looping condition.
Please discuss. Is the length property computed on the fly each time
it's called? Or does the array object actually store the length property
as a mutable integer that's adjusted only as needed?
Thanks for your wisdom.
Al
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