For functions, defined. 

if ( defined( &perlmonk::funnyfunction ) )

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For methods, can. Checks inheritance. 

if ( perlmonk->can('funnyfunction') )

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if ( $obj->can('funnyfunction') )

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In reply to Re: How to check if a function exists within a package? by ikegami
in thread How to check if a function exists within a package? by rapide

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