sort!() public

Sorts self in place.

Comparisons for the sort will be done using the <=> operator or using an optional code block.

The block must implement a comparison between a and b and return an integer less than 0 when b follows a, 0 when a and b are equivalent, or an integer greater than 0 when a follows b.

The result is not guaranteed to be stable. When the comparison of two elements returns 0, the order of the elements is unpredictable.

ary = [ "d", "a", "e", "c", "b" ]
ary.sort!                     #=> ["a", "b", "c", "d", "e"]
ary.sort! { |a, b| b <=> a }  #=> ["e", "d", "c", "b", "a"]

See also Enumerable#sort_by.

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January 16, 2017
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Sort Integers

ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-darwin16]

Sort From Greatest to Smallest

>> [1, 2, 3, 4].sort { |a, z| z <=> a }
=> [4, 3, 2, 1]