Read more, specifically perldoc perlsyn:

If any element of LIST is an lvalue, you can modify it by modifying VAR inside the loop. Conversely, if any element if LIST is NOT an lvalue, any attempt to modify that element will fail. In other words, the "foreach" loop index variable is an implicit alias for each item in the list that you're looping over.

In reply to Re: Variable scoping, foreach loop, alias by Fletch
in thread Variable scoping, foreach loop, alias by Vaati

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