Anonymous Recursion By Other Means
Although fixed point combinators are the standard solution for allowing a function not bound to an identifier to call itself, some languages like Perl provide a syntactical construct which allows anonymous functions to refer to themselves. For example, in Perl 5.16 and above, one can write the following:
use feature ":5.16"; sub { my $x = shift; $x == 0 ? 1 : __SUB__->( $x - 1 ); }Read more about this topic: Fixed-point Combinator, Implementing Fixed-point Combinators
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