Scope in CFC

[ice78991]

Question 1:


Within a <cffunction> there are 2 declarations

<cfset var someVar = 1>

and

<cfset someVar1 = 50>


Is it correct to say that someVar is only acccessible within the same <cffunction> whereas someVar1 will be accessible within all <cffunctions> contained in the cfc AND also accessible in any cfcs that extend this cfc

Question 2:

I have also seen cfcs that begin with the line

<cfset init()>

where init() will return the handle of a struct created with structNew()

For example

<cfset instance = structNew()>

<cfreturn instance>

What would the scope of instance be here ? Accessible within all cffunctions of this cfc and any cfcs that extend this cfc ( ie the same effect as <cfset someVar1 = 50> ) ?

 

[cfStarlight]

Is it correct to say that someVar is only acccessible within the same <cffunction>

Yes, because its declared with the keyword "var"

whereas someVar1 will be accessible within all <cffunctions> contained in the cfc AND also accessible in any cfcs that extend this cfc

Conceptually, yes. "someVar1" was declared without a scope, so by default its placed in the VARIABLES scope. The VARIABLES scope is accessible to other "cfcs that extend this cfc".

What would the scope of instance be here ?
...
(ie the same effect as <cfset someVar1 = 50>) ?

Yes. Because "instance" is placed in the VARIABLES scope.

where init() will return the handle of a struct created with structNew()

Its not required, but usually init() methods return a reference to the CFC instance. That way the function acts like a default constructor in a java class.

<cffunction name="init" ...>
   <cfreturn this />
</cffunction>