What is the difference between my and local in perl

So local creates a temporary scope for a temporary variable. Great question: How does our differ from my and what does our do? Available since Perl 5, my is a way to declare non-package variables, that are:. On the other hand, our variables are package variables, and thus automatically:. Declaring a variable with our allows you to predeclare variables in order to use them under use strict without getting typo warnings or compile-time errors.

Since Perl 5. The scope might be one, or two, or more packages, or one small block. To sort of make it work, there was some hackery that caused surprising results in some cases.

Rather than break backwards compatibility, a new, replacement pragma parent was introduced with cleaner semantics. Update: forgot that base handles fields if you are using the fields pragma , which parent doesn't do. As Dirk mentioned in his answer, there isn't actually a problem with the code that you posted. Destroy outside the program block. If defined at the beginning of the main program, it is equivalent to a global variable.

The local variable can appear in the called subroutine, and the value can be printed out. Recover when the block is out. Internal variables cannot be declared with my.

I'm writing Perl for quite some time now and always discovering new things, and I just ran into something interesting that I don't have the explanation to Scoping problem when sfApply is used within function package snowfall - R.

Let me add another scoping problem in R, this time with the snowfall package. If I define a function in my global environment, and I try to use that Any ideas? I'm following the docs here to add a context menu item to my grid. The issue is that from the scope of getContextMenuItems in the example , I'm unable I have a problem understanding why a variable i declared in a subroutine is seen in a contained subroutine, but that this is not true for a function Any explanation?

I have a test where I'm trying to mock a component in two different situations. When I use jest. It almost looks like the first test is just taking According to my programming language class, in a language that uses lexical scoping The body of a function is evaluated in the environment where the