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Contents
== Array#combination
require 'facets/array/combination'
finds pairs of combinations
e = [[1, 2], [1, 3], [1, 4], [2, 3], [2, 4], [3, 4]]
a = [1,2,3,4]
r = a.combination(2).to_a
r.assert == e
can also take a block
e = [[1,2],[1,3],[1,4],[2,3],[2,4],[3,4]]
r = []
a = [1,2,3,4]
a.combination(2){ |a,b| r << [a,b] }
r.assert == e
Version data entries
7 entries across 7 versions & 1 rubygems