[-1] is a negative array index, which lets you count from the other end of an array. $array[-1] is the same as [reverse @array]->[0] or $array[$#array]

<=> is a comparison operator for numbers, similar to cmp for strings. (see perlop or the sort documentation)

In reply to Re^3: Printing a Hash Slice problem by jhourcle
in thread Printing a Hash Slice problem by monkfan

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