CFLib.org – Common Function Library Project

Description:
This is similar to CFParam UDF, but uses structKeyExists() instead of isDefined() for slightly better performance and more easily debugged code.

Return Values:
Returns the value of the variable.

Example:

<cfset param(VARIABLES, "variablename")>
<cfset param(VARIABLES, "variablename", "testVar")>
<cfset param(URL, "variablename", "testURLVar")>
<cfset param(FORM, "variablename", "testURLVar")>

Parameters:

Full UDF Source:

/**
 * Function to duplicate the cfparam for scoped variables.
 * 
 * @param scope      Scope to check. (Required)
 * @param varname      Variable name to param. (Required)
 * @param value      Value to use. Defaults to a space. (Optional)
 * @return Returns the value of the variable. 
 * @author Robert Blackburn (skorpiun@gmail.com) 
 * @version 1, February 13, 2006 
 */
function param(scope, varname) {
    var value = "";
    
    if(arrayLen(arguments) gt 2) {
        value = arguments[3];
    }
    
    if(NOT structKeyExists(arguments.scope, arguments.varname) ) {
        arguments.scope[arguments.varname] = value;
    }
    
    return arguments.scope[arguments.varname];
}