prototypes can act as a check on the code to ascertain that function calls are performed properly, they indicate to Perl:

(updated)

prototypes are flexible, you can also indicate to a function whether a certain prototype is optional and you can include references to hashes in there. 
example:
sub NAME($$;$){...}  #mistake corrected

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this function expects 2 scalar arguments and one optional argument after the ";"...so bear in mind that not all of this is irrelevant and there will come a time when you'd better use a prototype in a function definition than pass it over.
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In reply to Re: USAGE OF Prototype by biohisham
in thread USAGE OF Prototype by abubacker

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