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@benphelps
Created November 6, 2012 22:54
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ri 'Array#<=>'
= Array#<=>
(from ruby site)
------------------------------------------------------------------------------
ary <=> other_ary -> -1, 0, +1 or nil
------------------------------------------------------------------------------
Comparison---Returns an integer (-1, 0, or +1) if this array is less than,
equal to, or greater than other_ary. Each object in each
array is compared (using <=>). If any value isn't equal, then that inequality
is the return value. If all the values found are equal, then the return is
based on a comparison of the array lengths. Thus, two arrays are ``equal''
according to Array#<=> if and only if they have the same length and the value
of each element is equal to the value of the corresponding element in the
other array.
[ "a", "a", "c" ] <=> [ "a", "b", "c" ] #=> -1
[ 1, 2, 3, 4, 5, 6 ] <=> [ 1, 2 ] #=> +1
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