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For 2023 - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
Erasing an array..

Posted by kitwalker2886 (kitwalker2886), 9 June 2007
I found using the push command to fill up an array very convenient because i don ve to keep track of the array index..
        but when i use the push command within a loop, the array will ve to be empty each time the loop starts or else i ll be carrying over the elements filled in the last iteration of the loop right..
         As a stop gap srrangement i just used a for loop to pop out all the elements from the aray at the end of the loop.. But is there any other more elegant method to completely erase the contents of a specified array..??

Posted by admin (Graham Ellis), 9 June 2007
$#listname = -1;

will clear the contents of a list called @listname

undef @listname;

will erase a list and all its contents.

The first option leaves you with an empty list, and the second does not.

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