Conditional Cfloop code to place AND at first loop - coldfusion

Question

Using the following query, I am trying to do a simple case here when the first record it encounters it should basically add "AND" and for the remaining conditions, I want to add OR
Here is my try
<cfif isDefined('age') and len(trim(age)) and age neq '-1'>
<cfset age = trim(htmlEditFormat(lcase(age)))>
<cfloop list="#age#" index="k">
or age between #ListFirst(k,'-')# and #ListLast(k,'-')#
</cfloop>
</cfif>
trying to make it work like this
and (age between 18 and 20
or age between 20 and 25
or age between 25 and 30)
I am not getting where I should add a condition to add parenthesis and the AND operator.

Answer 1

You could do something as similar as adding a false statement and then looping through everything else as needed
<cfif isDefined('age') and len(trim(age)) and age neq '-1'>
<cfset age = trim(htmlEditFormat(lcase(age)))>
AND (1 = 2 --always returns false
<cfloop list="#age#" index="k">
OR age between #ListFirst(k,'-')# and #ListLast(k,'-')#
</cfloop>
)
</cfif>
This is what you were trying to do
<cfif isDefined('age') and len(trim(age)) and age neq '-1'>
<cfset age = trim(htmlEditFormat(lcase(age)))>
AND (
<cfloop list="#age#" index="k">
<cfif listFirst(age) NEQ k> OR </cfif> --if it's not the first iteration, add the OR
age between #ListFirst(k,'-')# and #ListLast(k,'-')#
</cfloop>
)
</cfif>

Answer 2

An alternative that doesn't require an if block and would work for any type of loop:
<cfif isDefined('age') and len(trim(age)) and age neq '-1'>
<cfset age = trim(htmlEditFormat(lcase(age)))>
<cfset expressionSeparator = "">
AND (
<cfloop list="#age#" index="k">
#expressionSeparator#
age between #ListFirst(k,'-')# and #ListLast(k,'-')#
<cfset expressionSeparator = " or ">
</cfloop>
)
</cfif>