Print Page - catch and throw functions

Title: catch and throw functions
Post by: dukester on August 14, 2007, 09:00:29 PM

Hey...

on p19 of "Introduction-to-newLISP" the following example is given:

(catch

(for (i 0 9)

(if (= i 5) (throw (string "i was " i)) )

(print i " ")

)

)

For some reason, the above does not print "i was 5", yet it does print the correct output. What am I missing? TIA...

--

dukester

Title:
Post by: Jeff on August 15, 2007, 05:15:15 AM

Because "i was 5" is the value of the catch. It was not caught into any symbol, so there was no output. If you run it inside the repl, the entire expression will evaluate to "i was 5", but only the print statement will print things out.

Here is a more comprehensive tutorial I wrote on newLisp error handling and flow control using catch/throw:

//http://artfulcode.nfshost.com/files/simple-error-handling-in-newlisp.html

Title:
Post by: dukester on August 15, 2007, 10:57:06 PM

~~Quote from: "Jeff"~~Because "i was 5" is the value of the catch. It was not caught into any symbol, so there was no output. If you run it inside the repl, the entire expression will evaluate to "i was 5", but only the print statement will print things out.

Here is a more comprehensive tutorial I wrote on newLisp error handling and flow control using catch/throw:

//http://artfulcode.nfshost.com/files/simple-error-handling-in-newlisp.html

Thanks for the URL. Nice article!! Helped a lot.

Title:
Post by: Jeff on August 16, 2007, 04:55:41 AM

Glad to be of service ;)

newLISP Fan Club

Forum => Anything else we might add? => Topic started by: dukester on August 14, 2007, 09:00:29 PM