Types of Scope I
Explore the concept of scope in Perl, focusing on lexical scope and how it controls variable visibility and lifespan. Understand how lexical variables work in different blocks and functions, how shadowing affects variable access, and how closures leverage outer lexical variables for encapsulation and maintainability.
We'll cover the following...
Everything with a name in Perl (a variable, a function, a filehandle, a class) has a scope. This scope governs the lifespan and visibility of these entities. Scoping helps enforce encapsulation—keeping related concepts together and preventing their details from leaking.
Lexical scope
Lexical scope is the scope apparent to the readers of a program. Any block delimited by curly braces creates a new scope: a bare block, the block of a loop construct, the block of a subdeclaration, an eval block, a package block, or any other nonquoting block. The Perl compiler resolves this scope ...