Besides the fact that built-in functions are predefined and are part of the=
 language, are there any characteristic differences between them? Given b_f=
ct  a built-in function, and u_fct a user-defined function, are there any p=
roperties that I can programmatically query to show that b_fct is built-in =
function, and similarly for u_fct? This question is just a curiosity.

On 10/12/2016 22:33, An Luutran wrote:
> Besides the fact that built-in functions are predefined and are p
>



#!/usr/bin/perl
use feature qw/say/;
sub f1 {}

say TestFunctions('f1');
say TestFunctions('hex');
say TestFunctions('f2');

sub TestFunctions {
__PACKAGE__->can("CORE::$_[0]") ? 'built in':
__PACKAGE__->can($_[0]) ? 'user':'not exist'
}