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Contents
covers 'facets/enumerable/map_by'
tests Enumerable do
unit :map_by do
a = [1,2,3,4,5]
r = a.map_by{ |e| [e % 2, e + 1] }
r.assert == { 0=>[3,5], 1=>[2,4,6] }
end
unit :map_by => "works well with a hash" do
h = {"A"=>1, "B"=>1, "C"=>1, "D"=>2, "E"=>2}
r = h.map_by{ |k,v| [v, k.downcase] }
r.assert == {1=>["a", "b", "c"], 2=>["d", "e"]}
end
unit :map_by => "if only a scalar is returned, #map_by acts like #group_by" do
h = {"A"=>1, "B"=>1, "C"=>1, "D"=>2, "E"=>2}
r = h.map_by{ |k,v| v }
r.assert == {1=>[["A",1], ["B",1], ["C",1]], 2=>[["D",2], ["E",2]]}
end
end
Version data entries
4 entries across 4 versions & 1 rubygems