edf50fdf80
- Run mix credo --all to identify possible code optimizations - Resolve most of the errors generated by credo such as: - Numbers larger than 9999 should be written with underscores: 58_127 - Modules should have a @moduledoc tag - Comparison will always return true
75 lines
1.8 KiB
Elixir
75 lines
1.8 KiB
Elixir
defmodule Lists do
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@moduledoc false
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use Koans
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@intro "Lists"
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koan "We can see what is ahead" do
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assert List.first([1, 2, 3]) == ___
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end
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koan "Checking what's trailing is also simple" do
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assert List.last([1, 2, 3]) == ___
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end
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koan "Lists can store anything you throw at them" do
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assert [1, 2] ++ [:a, "b"] == ___
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end
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koan "Things can evolve" do
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assert [1, 2, 3] -- [3] == ___
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end
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koan "Evolution can have different forms" do
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assert List.delete([:a, :b, :c], :b) == ___
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end
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koan "Precision is also valued" do
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assert List.delete_at([:a, :b, :c], 2) == ___
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end
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koan "Replication is also possible" do
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assert List.duplicate("life", 3) == ___
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end
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koan "Sometimes leveling the playing field is desired" do
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assert List.flatten([1, [2, 3], 4, [5]]) == ___
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end
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koan "Order can also be specified for new members" do
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assert List.insert_at([1, 2, 3], 1, 4) == ___
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end
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koan "We can replace things at specified positions" do
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assert List.replace_at([1, 2, 3], 0, 10) == ___
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end
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koan "When a replacement cannot be found, the list remains the same" do
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assert List.replace_at([1, 2, 3], 10, 0) == ___
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end
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koan "Order is bound by nature's laws" do
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assert List.insert_at([1, 2, 3], 10, 4) == ___
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end
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koan "Sometimes it's faster to loop around back" do
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assert List.insert_at([1, 2, 3], -1, 4) == ___
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end
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koan "We can also transform ourselves completely" do
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assert List.to_tuple([1, 2, 3]) == ___
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end
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koan "Wrapping other values is a handy option" do
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assert List.wrap("value") == ___
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end
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koan "Wrapping nothing produces a list of nothing" do
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assert List.wrap(nil) == ___
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end
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koan "When there is already a list do not wrap it again" do
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assert List.wrap(["value"]) == ___
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end
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end
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