topic Re: Returning either list of rows or NULL in my function. How do I work with multiple return values in a jsl-script? in Discussions

Returning either list of rows or NULL in my function. How do I work with multiple return values in a jsl-script?

martinschmid — Wed, 10 Aug 2016 13:32:43 GMT

I guess my problem can be solved pretty easily.

I want to write a function, that either returns a list of row-numbers or NULL in dependency of an if-clause inside my function.

How can I handle multiple return values and how can I return NULL?

My function should look somehow like this:

myFunction = Function( {...}, {...},

list = { ... };

if(...)

then return list

else return NULL

);

I have already found this tutorial:

but what if I have multiple return values, like:

return1=...

return2=...

how do I handle these, and how do I return NULL then?

Thank You for your help!

pmroz — Wed, 10 Aug 2016 14:04:25 GMT

Might be safer to return a 0-element list if your if clause doesn't find any row numbers.

myFunction = Function( {...}, {...},

my_list = {};

if (my_test,

my_list = {1, 2, 3}; // Test passed, return values

);

my_list;

);

one_list = myFunction(...);

if (nitems(one_list) > 0,

// handle items in the list

);

martinschmid — Thu, 11 Aug 2016 07:11:24 GMT

Thank You!

This solved my problem.