April 2025
Intermediate to advanced
124 pages
2h 8m
Italian
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Capitolo 29. Accoppiamento
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Per prepararsi a scrivere il loro classico testo Structured Design, Ed Yourdon e Larry Constantine esaminarono i programmi per capire cosa li rendesse così costosi. Notarono che i programmi costosi avevano tutti una proprietà in comune: la modifica di un elemento richiedeva la modifica di altri elementi. I programmi economici tendevano a richiedere modifiche localizzate.
Hanno soprannominato questa proprietà di infezione del cambiamento "accoppiamento". Due elementi sono accoppiati rispetto a un particolare cambiamento se la modifica di un elemento richiede la modifica dell'altro elemento.
Ad esempio, una funzione chiamante è accoppiata a una funzione chiamata per quanto riguarda le modifiche al nome della funzione chiamata:
caller()
called()
called() // changing this name requires changing the call site(s) too
... // changing the formatting of the body requires no changes to call sites
Il secondo commento sottolinea un'importante sfumatura dell'accoppiamento: non possiamo limitarci a dire che due elementi sono accoppiati. Per dire qualcosa di utile, dobbiamo anche dire accoppiati rispetto a quali cambiamenti. Se due elementi sono accoppiati rispetto a un cambiamento che non avviene mai, allora non sono accoppiati in un modo che dovrebbe preoccuparci. Questo accoppiamento è il masso in cima alla collina che non rotola ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.