The 'use strict' pragma is a little hard to get used to if you have been coding a while without it, but can be a great help in creating and debugging your programs. 'use strict' lets the perl interpreter know that you want all variables, subs, and references to be declared and scoped. Here's an example. In the following code it might be hard to figure out why the expected result doesn't print:
foreach $computer(@hostlist){ print "Now working on $Computer\n"; } In this short example it is relatively easy to see that $computer was accidentally capitalized, so the expected result will not print. Without 'use strict', Perl would obligingly create a variable with the new name and print the contents, undef in this case. If you tried to do this under the 'use strict' pragma, the interpreter would generate errors. First of all, you would need to declare $computer with 'my', so your code would look more like this: my @hostlist; foreach my $computer(@hostlist){ print "Now working on $computer\n"; } And if you accidentally capitalized $computer, the interpreter would think you were trying to use a variable that wasn't declared with 'my', and would generate errors, possibly saving you huge headaches as you try to retrace your steps to find out why $computer isn't printing out. This is just off the top of my head, but try to use it in some of your scripts. After you've worked away at it and gotten it to work, you'll get a better idea of what it can do. While you're at it, read up on 'my'. You'll need a good idea of how to use lexical scoping in your scripts. If you have more specific questions, go ahead and post them here. Happy coding! :) -----Original Message----- From: Yuan Cheng To: [EMAIL PROTECTED] Sent: 3/15/02 7:29 PM Subject: the scope of 'use strict' HI, all: I am wondering what else 'use strict' does besides it is stated in the perldoc that it stricts on use of 'vars', 'refs' and 'subs'. Thanks. yc __________________________________________________ Do You Yahoo!? Yahoo! Sports - live college hoops coverage http://sports.yahoo.com/ -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -------------------------------------------------------------------------------- This email may contain confidential and privileged material for the sole use of the intended recipient. If you are not the intended recipient, please contact the sender and delete all copies. -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]