I'm unable to understand what exactly this code doing:
exists $is_prime{$_} and $is_prime{$_}
my %is_prime;
@primes = grep {
( exists $is_prime{$_} and $is_prime{$_} )
or
( $is_prime{$_} = is_prime($_) )
} @numbers;
I appreciate your time to read and answer and thank u in advance. :)
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