00eb17014a
While doing this, I also discovered that there is also a reference to lists in numbers, but that might a bit easier for someone to grasp, given the hint that the koan gives, and the output they see when they run it.
85 lines
2.0 KiB
Elixir
85 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 "How large is my map set?" do
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assert MapSet.size(@set) == ___
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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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