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Listing 34-6. Using DeserializeJSON to Convert JSON Output into ColdFusion Data <cfset newData = deserializeJSON(json1)> <cfset newData2 = deserializeJSON(json2)> <cfdump var="#newData#"> <cfdump var="#newData2#"> If you run Listing 34-6, you will notice something odd. (Be sure you add this code to the end of Listing 34-5.) The variable json1 was created from our query, but when it s converted from JSON back into a native ColdFusion variable, we no longer have a query. Instead we have a structure with two keys: columns and data. The deserializeJSON function has an optional second parameter, strictMapping, that determines how it should deserialize the JSON data. The value of strictMapping is true by default and tells ColdFusion to convert the information as strictly as possible from JSON. Since JavaScript doesn t have a query datatype like ColdFusion, the JSON representation of a ColdFusion query looks more like a structure. Therefore, when converting back, you end up with a structure. By setting strictMapping to false (see Listing 34-7), you end up with a native ColdFusion query. Listing 34-7. Setting strictMapping to False When Using DeserializeJSON <cfset newData = deserializeJSON(json1,false)> Now let s take a look at the last JSON-related function, isJSON. This is rather simple, so our example (Listing 34-8) will also be simple. Listing 34-8. An Example Using isJSON <cfset data = ["Jacob", "Lynn", "Noah", "Mazie"]> <cfset jsonString = serializeJSON(data)> <cfif isJSON(data)> data is JSON <cfelse> data is NOT JSON </cfif> <p> <cfif isJSON(jsonString)> jsonString is JSON <cfelse> jsonString is NOT JSON </cfif> Running Listing 34-8 will return: data is NOT JSON jsonString is JSON

Perl allows subroutines to be called in two alternate syntaxes: functions with parentheses or list operators. This allows subroutines to be used as if they were one of Perl s built-in list operator functions such as print or read (neither of which require parentheses). This syntax is only valid if Perl has already either seen the subroutine definition or a declaration of the subroutine. The following subroutine call is not legal, because the subroutine has not yet been defined: debug "This is a debug message"; #...rest of program... sub debug { print STDERR @_, "\n"; } # ERROR: no parentheses

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The intention here is to create a special debug statement, which works just like the print statement, but it prints to standard error rather than standard out, and ends with an automatic linefeed. Because we want it to work like print in all other respects, we would prefer to omit the brackets if we choose to, just as print does. To do this, we must predeclare the subroutine before we use it: # predeclare subroutine 'debug' sub debug; debug "This is a debug message"; #...rest of program... sub debug { print STDERR @_, "\n"; } Subroutines are also predeclared if we import them from another package (see 10 for more on packages), as in use mypackage qw(mysubroutine); # no error

Another way to predeclare subroutines is with the use subs pragma. This not only predeclares the subroutine, but also it allows us to override Perl s existing built-in functions and replace them with our own. We can access the original built-in function with the CORE:: prefix. For example, the following is a replacement version of the srand function, which issues a warning if we use srand in a version of Perl of 5.004 or greater without arguments.

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