topic Re: USER defined functions: Check if the function exists/loaded after Include in Discussions

USER defined functions: Check if the function exists/loaded after Include

dileepkr — Mon, 22 Jul 2019 18:41:07 GMT

Hi Folks,

I am trying to figure out a way to check if a user defined function exists before calling it. Is there a way to do this check in JMP?

Eg:

user_func.jsl:

user_func = Function ({},{},

.....

);

Main.jsl:

Include("C:\Documents\user_func.jsl")

down in the code

??How to check if user_func exists??

Re: USER defined functions: Check if the function exists/loaded after Include

txnelson — Mon, 22 Jul 2019 19:14:46 GMT

You can use the IsEmpty() function. See the example below;

Clear Symbols();
Show( Is Empty( user_func ) );
user_func = Function( {}, {} );
Show( Is Empty( user_func ) );clear symbols();

Re: USER defined functions: Check if the function exists/loaded after Include

dileepkr — Mon, 22 Jul 2019 19:23:32 GMT

That worked, thank you very much !

Re: USER defined functions: Check if the function exists/loaded after Include

dileepkr — Wed, 24 Jul 2019 19:08:37 GMT

Hi Jim @txnelson ,

In another case, what to do if the function name is stored as a string in a variable?

Clear Symbols();

user_func = Function( {}, {} );

func_name = "user_func";

Show( Is Empty( Parse(func_name) ) ); //This doesnt work, any alternatives???

Clear Symbols();

Re: USER defined functions: Check if the function exists/loaded after Include

txnelson — Wed, 24 Jul 2019 19:16:31 GMT

Here is how I would handle that case

func_name = "user_func";eval(parse("Show( Is Empty( " || func_name || ") ) ;"));

Re: USER defined functions: Check if the function exists/loaded after Include

Mark_Bailey — Wed, 24 Jul 2019 19:24:45 GMT

Names Default to Here( 1 );

user_func = Function( {}, Print( "I'm Here!" ) );
func_name = "user_func";

Show( Is Empty( Parse( func_name || "()" ) ) );