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What’s the best naming prefix for a global variable?
//
I saw this joke on the wall in my CS lab and, being fairly inexperienced in C++, didn't get it.
Could someone explain it to me?
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Using global variables causes very tight coupling of code. Using global variables causes namespace pollution. This may lead to unnecessarily reassigning a global value. Testing in programs using global variables can be a huge pain as it is difficult to decouple them when testing.
Global variables should only be used when you have no alternative. And yes, that includes Singletons. 90% of the time, global variables are introduced to save the cost of passing around a parameter.
Although you should try to avoid the use of global variables, it is generally permissible to use global constants in a program. A global constant is a named constant that is available to every function in a program.
Avoid globals. Global variables and function names are an incredibly bad idea. The reason is that every JavaScript file included in the page runs in the same scope.
// means that the rest of the line is a comment. Global variables are generally seen as poor design, so the joke is that the best thing to do with global variables is to get rid of them.
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