Day / Days of Code: Lessons on Scope

Sat, August 24, 2024

Today’s lesson was all about scope, which is incredibly important in programming. We definitely don’t want our data to be unintentionally rewritten by a function!

A conversation with a senior developer got me thinking about the use of global variables. He'd mentioned that there are times when he uses them, which piqued my curiosity. So, I asked Perplexity AI about how often software companies follow best practices regarding local or block scope. It turns out global variables are sometimes used in legacy code, quick prototyping, to avoid refactoring complex code structures, for configuration variables, and for thread-safe storage. These insights were really insightful!

Even better, the AI discussed the tradeoffs and concerns associated with using global variables. One interesting point was about code reviews. I learned that code reviews are nearly continuous and performed at all levels as part of ongoing quality control. They can be very comprehensive, which makes sense intuitively but was new to me.

Despite some unrelated tasks that popped up, I managed to stay productive. Overall, it was a great day of learning!

The above is the detailed content of Day / Days of Code: Lessons on Scope. For more information, please follow other related articles on the PHP Chinese website!