Perl Interview Question: What is the difference between Perl's "my" and "our" variable declarations, and when would you use each?

In Perl, both "my" and "our" are used for variable declarations, but they have different scopes and visibility.

my:

The "my" keyword is used to declare a private variable that is only accessible within the block of code where it is declared. It has lexical scope, meaning it is limited to the scope in which it is declared. This makes it suitable for temporary variables or variables that do not need to be shared across different parts of the program.

our:

The "our" keyword is used to declare a global variable that is accessible across different parts of the program. It has package scope, meaning it can be accessed outside of the block where it is declared. This makes it useful for variables that need to be shared among multiple modules or packages.

When to use each:

Use "my" when you need to declare a variable with a limited scope and do not need it to be accessed outside of that scope. Use "our" when you need to declare a variable with global scope that can be shared across different parts of the program.

Understanding the difference between "my" and "our" variable declarations is important for managing the scope and visibility of variables in Perl programs.