81 lines
2.0 KiB
Elixir
81 lines
2.0 KiB
Elixir
defmodule MapSets do
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use Koans
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@intro "My name is Set, MapSet."
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@set MapSet.new([1, 2, 3, 4, 5])
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koan "I am very similar to a list" do
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assert Enum.fetch(@set, 0) == {:ok, ___}
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end
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koan "However, I do not allow duplication" do
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new_set = MapSet.new([1, 1, 2, 3, 3, 3])
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assert MapSet.size(new_set) == ___
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end
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def sorted?(set) do
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list = MapSet.to_list(set)
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sorted = Enum.sort(list)
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list == sorted
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end
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koan "You cannot depend on my order" do
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new_set = MapSet.new(1..33)
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assert sorted?(new_set) == ___
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# Note: The number "33" is actually special here. Erlang uses a different
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# implementation for maps after 32 elements which does not maintain order.
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# http://stackoverflow.com/a/40408469
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# What do you think this answer to this assertion is?
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assert sorted?(@set) == ___
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end
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koan "Does this value exist in the map set?" do
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assert MapSet.member?(@set, 3) == ___
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end
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koan "I am merely another collection, but you can perform some operations on me" do
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new_set = MapSet.new(@set, fn x -> 3 * x end)
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assert MapSet.member?(new_set, 15) == ___
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assert MapSet.member?(new_set, 1) == ___
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end
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koan "Add this value into a map set" do
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modified_set = MapSet.put(@set, 6)
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assert MapSet.member?(modified_set, 6) == ___
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end
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koan "Delete this value from the map set" do
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modified_set = MapSet.delete(@set, 1)
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assert MapSet.member?(modified_set, 1) == ___
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end
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koan "Are these maps twins?" do
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new_set = MapSet.new([1, 2, 3])
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assert MapSet.equal?(@set, new_set) == ___
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end
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koan "I want only the common values in both sets" do
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intersection_set = MapSet.intersection(@set, MapSet.new([5, 6, 7]))
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assert MapSet.member?(intersection_set, 5) == ___
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end
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koan "Unify my sets" do
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new_set = MapSet.union(@set, MapSet.new([1, 5, 6, 7]))
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assert MapSet.size(new_set) == ___
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end
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koan "I want my set in a list" do
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assert MapSet.to_list(@set) == ___
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end
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end
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