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Note differences between my() and local()
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my($x); # declares $x to be private to the block
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local($x); # declares $x to be known to this block and all routines invoked within the block
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Typeglob or symbolic reference can be used to pass arguments by reference and not by value
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This has usual advantage that subroutine alters "global" and not a "local" copy -- especially relevant for complex data structures where you do not want expense of copying
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Scalars are always passed by reference (not by value); by explicitly changing $_[0..], you can affect global scalars
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