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Re^6: VarStructor 1.0

by pfaut (Priest)
on Sep 02, 2004 at 13:59 UTC ( #387914=note: print w/ replies, xml ) Need Help??


in reply to Re^5: VarStructor 1.0
in thread VarStructor 1.0

Complexity increases as scope widens. If you have references to a variable throughout a 3000 line script, then you need to understand all 3000 lines to know how that variable is used. Multiply this by the number of global variables.

On the other hand, if you package functionality into smaller units, all you need to understand is the interfaces provided by each unit. A well designed unit would present an intuitive interface and hide a lot of implementation detail. If the interface is well thought out, the implimentation could easily be changed without affecting any other code.

If I had to maintain that program, my first inclination would be to refactor it into several smaller units that could each be understood on its own. If I didn't have the time, I'd locate all of the globals, declare them in one place, and write a subroutine to initialize them. I'd then call this initialization routine at the beginning of the loop. After I got this done and put the program to use, I'd go back and refactor it so it could be properly maintained and extended if necessary. Under no circumstances would I attempt to extend code like this without refactoring it first.

90% of every Perl application is already written.
dragonchild


Comment on Re^6: VarStructor 1.0
Re^7: VarStructor 1.0
by Wassercrats on Sep 02, 2004 at 18:43 UTC
    I've often wanted to know what part of the script changed a variable in a certain way, but scoping wouldn't help in my case. A typical problem for me would be that I print out data from my link checker, and see something unusual that could have be put there by several blocks, in any iteration. If those blocks were scoped, I'd still need debugging print statements in them to see what caused the problem.

    Maybe your argument is too abstract for me, or I don't remember when scoping would have helped, but I've gotten by fine with my use of comments. It's alot easier for me to avoid confusion in scripts by put things in words than changing to a programming style that's counterintuitive and not what I'm accustomed to.

    You said "I'd locate all of the globals...." Use VarStructor 1.0 for that.

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