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Perl in a Nutshell

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Standard Modules
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$sub = $obj->can(method)

Checks if object $obj has a method method. If so, returns a reference to the subroutine, otherwise returns undef. Can be called as either a static or object method call, or as a subroutine:

$ref = UNIVERSAL::can(val, method)
Returns a reference to the subroutine if val is a blessed reference with a method method, and undef if val is not blessed or does not have method.

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8.163 UNIVERSALBook IndexReference: isa