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Re: On Commenting Out 'use strict;'

by davorg (Chancellor)
on Aug 11, 2005 at 09:09 UTC ( [id://482871]=note: print w/replies, xml ) Need Help??


in reply to On Commenting Out 'use strict;'

If I had been there, the conversation would have gone something like this.

name used only once

You are either putting data into a variable and not getting it out again (which seems pointless) or trying to get data out of a variable that you haven't put data into (which seems stupid).

global symbol requires package reference, things like that

Your code has variables that can be (accidently!) used outside of the necessary scope. This is dangerous.

It cluttered up the SYSOUT and made it hard to find the real bugs

This are the real bugs. Fix them.

--
<http://dave.org.uk>

"The first rule of Perl club is you do not talk about Perl club."
-- Chip Salzenberg

Replies are listed 'Best First'.
Re^2: On Commenting Out 'use strict;'
by Anonymous Monk on Aug 11, 2005 at 12:41 UTC
    Your code has variables that can be (accidently!) used outside of the necessary scope. This is dangerous.
    Yes, but it's good to realize that "use strict" doesn't magically fix that. Accidently using variables outside of the necessary scope happens when variables are defined using a scope that's too broad. It's pretty hard to accidently use variables from a different package - you would have to explicitely point to that package. Problems are cases like:
    $var = "whatever"; sub foo { ... while ($var = <HANDLE>) { ... } ... } sub bar { ... foo(); ... code assuming $var is unmodified ... }
    Slapping a use strict; on top of the code, and putting a my in front of the first occurance of $var doesn't solve this problem - although it makes use strict very happy.

    What does solve the problem is declaring a lexical variable my $var, or a local value local $var inside foo(), neither of which actually requires use strict.

    use strict is a tool. It ain't no magical bullet.

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