CODEWITHSUNDEEP
flutterdart
Mayvas
Mayvas

Reputation: 789

Why do we need private variables in Flutter Widgets

The question is simple & hard to understand at the same time. Why do I need to mark all my variables in the Statefull Widget as private?

Now when I declare a variable I declare it like private.

bool _isOpened = true;
String _currentUserUID;
...

But why do I need this? I do not access these variables from other widgets. I do not override. I know my app logic & totally insured in the safety of my code in all widgets.

So why do I need private variables? Is there any impact of using private variables & methods? Maybe performance benefits?

Upvotes: 6

Views: 1658

Answers (1)

GrahamD
GrahamD

Reputation: 3165

The prefix _ makes the variable private within the .dart code file you are in. The IDE (or at least VSCode, that I use) will then be able to tell you if you are using the variable or not. It also tells me, as the developer, that I need look no further than the code file that I am working in for changes to this variable. All important information as far as I am concerned.

The same is true when making methods private with the _ prefix. This is also highly recommended.

However, imho, this question relates to the the use of private variables in general so here is a link to a more general question and a much better set of answers than mine https://softwareengineering.stackexchange.com/questions/143736/why-do-we-need-private-variables

Upvotes: 8

Related Questions