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On 2/3/2017 2:01 PM, Duane Scott wrote:
I would love to have everyone I work with agree that thinking along the lines of enhancing as we go.
I am the active maintainer of a S/3-era matching record program which
sees daily use. Yes, I am the Last of the Matching Recordians. This
thing has program described I specs, program described O specs (for disk
files as well as printer files. Thousands of lines of left-indicator
goodness. It's hard to modify without a cascade of unintended consequences.
One of the very first things I did when I had to add code to this thing
was to make the additions sub-procedures. Saved my life. Because
instead of having a variable be changeable throughout all thousands of
LOC, I can have isolated variables which can only be read and written
inside that sub-procedure. Local scope is the best!
Every time I add a new sub-procedure to this, the program becomes more
resilient, less buggy, and easier to understand. So it is absolutely
possible to add sub-procedures to enhance code - even ancient code -
incrementally and safely. No need to do a mass conversion or anything
drastic.
midrange.com
