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An exposition of ikegami's reply (beginners in mind):

  • my @sorted = sort { $a <=> $b } @numbers;
    Calls sort on @numbers, storing returned list in @sorted. Passes sort a code block to use as a comparison function (used to determine whether to swap two elements). $a and $b can be used within the code block to reference the elements being compared. To reverse the sort order, reverse $a and $b in the code block:
    sort { $b <=> $a } @numbers
  • my $min = $sorted[0];
    sort { $a <=> $b } will sort the numbers in ascending order, so the first element of the resultant array is the minimum.
  • my $max = $sorted[-1];
    An index of -1 refers to the last element, which is of course the maximum.

undef $lunches{free}

In reply to Re^2: sort an array with +ve & -ve numbers in it by missingthepoint
in thread sort an array with +ve & -ve numbers in it by Anonymous Monk

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