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my $method = "build_a_kite";
if ($obj->can($method)) {
...
else {
    print "We can't...";
}

$obj->can( METHOD ), CLASS->can( METHOD ), can( VAL, METHOD )

...
name which has a method called METHOD, can returns a reference to
the subroutine. If VAL is not a blessed reference, or if it does
not have a method METHOD, undef is returned.