⭐ in reply to How do I write my own sorting routine?
return -1 means $a goes before $b, return +1 means $b goes before $a, return 0 means they are equal.
The "spaceship operator", <=>, returns -1, 0, or 1 depending on whether the left argument is numerically less than, equal to, or greater than the right argument.
Its stringwise counterpart, cmp, returns -1, 0, or 1 depending on whether the left argument is stringwise less than, equal to, or greater than the right argument.
To learn more about these operators, please read perlop.
To learn more about the sort function, please read perlfunc.
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