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## which are finally assigned to the array                      ## 4 #
+#
my @newest = (
...
    ## which it then reduces to just a list of directories
    grep -d, glob '/*'
)[0..19]; ## then this "list slice" selects the 20 most recent  ## 3 #
+#

my @allFilesnDirs = glob '/*';

...
my @allDirsSortByDateTime = sort{ -M $a <=> -M $b } @allDirs;

my @newest20 = @allDirsSortedByDateTime[ 0..19 ];