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1 - logically properties are properties, variables are variables; 2 - very often you have to check the value assigned to a property, prevent incorrect values; 3 - not rarely you will have a read-only property, you cannot do it with a public variable. Last but not least... you cannot add comment lin
link: For me using public variables instead of properties is almost... unnatural ? , so I wouldn't want that possibility at all. Mine was a message, an inv

Well, a variable is volatile data, as you know, and this is a "big" difference (and use case).

Define your UP variable in Class_Globals as Public UP As Byte. Then when you receive data you can compare it to CMDS.UP B.T.W. your thread title is not informative. If my answer is not useful consider changing the title.
link: There are no class variables. They are instance variables/constants. If you don't instantiate the class, you cannot use these. To have something like
link: I have a class called CMDS. Inside that class I have a lot of variables defined ex: Dim UP As Byte = 5 Dim DOWN As Byte = 6 In my main program

There are two sorts of objects, primitives, like Ints, Doubles, Booleans etc, and object instances. Variables can be regarded as a memory address that stores a value. For variables declared as primitives the value stored is that of the primitive. For variables declared as instances the value is a p
link: No, listA and listB will be two variables pointing to the same object, so whatever property or method you use of one of the two will act on the other

The name a variable or object / class is something that appears in the ide environment but is lost in compilation, so in execution asking for a name makes no sense. This is especially true for those variables that are indicated by reference. You can achieve a similar thing with the Map though. Nam

Simple variables (e.g. int, Boolean, long, string, etc.) behave that way. Object variables (e.g. List, Map, etc.) usually have an "Initialize" method you must invoke before you may use them. For example: Dim MyInt as Int Dim MyList as List MyInt = 1 Mylist.Initialize MyList.Add(MyInt) @Erel has
link: Hi, Just a small doubt I couldn't find the answer for in B4X documentation: In VB 6 variables are always initialized when they are declared. For ins
link: Yes, I mean that, since unfortunately the compiler initializes your simple variables, you should inizialize numeric variables to -1.
link: Variables are set to the default values in B4A, B4i and B4J. This is not the case with local variables in B4R. Better to write: Dim intSeconds As I

All variables. Global/Process_Globals are global to the module at hand. The color coding of the variables in the IDE should give you a hint of their scope.

Memory is a big issue in Arduino. 1. The available RAM is very small compared to other platforms. For example the Uno has 2k of RAM. 2. There is no sophisticated heap management which means that usage of dynamic memory should be avoided. 3. Programs are expected to run for a long time with zero mem
link: does that mean Dim i(10) As Int is equivalent to Dim i(0 to 9) as int, so I shouldn't assign anything to i(10)?

Tip? Hint? To everyone, including me. The name of variables, class members, views, etc. it is important but it will never be exhaustive, it will not always be enough to make you understand exactly what they are and, in the case of properties, what values to assign to them. The one in the image

Not true I'm afraid. Variables declared in Sub Globals in an Activity are local to the Activity and are lost when the Activity is destroyed. Variables declared in Sub Process_Globals in an Activity belong, as the name implies, to the entire process and are only lost when the entire process is destro
link: Static variables, useful (which, btw, I miss in the subs) make sense but not in a class, in the instances of the class.
link: Wrong - you obviously don't understand static class variables. They exist as part of the class definition that is used to make instances of that class
link: If I understand correctly, the variables that are written in Process_Globals will be created when the Activity Module is created. How long can they ex

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