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ruby programming

Combinations

Implements Array#combinations(n) which returns or yields (depending on block_given?) all the combinations of n elements from the array.

> ruby
require "combo"
a=[1,2,3,4,5]
p a.combinations(3)
^D
[[1, 2, 3], [1, 2, 4], [1, 2, 5], [1, 3, 4], [1, 3, 5], [1, 4, 5], [2, 3, 4], [2, 3, 5], [2, 4, 5], [3, 4, 5]]