Sha256: e003e05a0b62c86a43f3e5566c688cc016adc09e8205366a58ef1ed812202c13
Contents?: true
Size: 701 Bytes
Versions: 7
Compression:
Stored size: 701 Bytes
Contents
class Array
# The array is expected to be and array of arrays, which
# iterates through combinations of each in position.
#
# a = [ [0,1], [2,3] ]
# a.each_combo { |c| p c }
#
# produces
#
# [0, 2]
# [0, 3]
# [1, 2]
# [1, 3]
#
def each_combo
a = collect{ |x|
x.respond_to?(:to_a) ? x.to_a : 0..x
}
if a.size == 1
r = a.shift
r.each{ |n|
yield n
}
else
r = a.shift
r.each{ |n|
a.each_combo{ |s|
yield [n, *s]
}
}
end
end
# As with each_combo but returns combos collected in an array.
def combos
a = []
each_combo{ |c| a << c }
a
end
end
Version data entries
7 entries across 7 versions & 1 rubygems