I just received a great question from a former student regarding passing by reference vs. passing by value in ColdFusion.
I know in some languages you can choose whether you are passing by reference or by value. In CF, it is kind of tricky.
Basically, if you pass a simple value (regular variable or array) will be passing by value, but if you pass a complex object (cfc, struct, query, etc) you will be passing by reference.
I found this great blog posting from Ray Camden which explains it very well. Check it out!
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