35 lines
836 B
Elixir
35 lines
836 B
Elixir
defmodule KeywordLists do
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use Koans
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@intro "KeywordLists"
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koan "Like maps, keyword lists are key-value pairs" do
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kw_list = [foo: "bar"]
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assert kw_list[:foo] == ___
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end
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koan "Keys may be repeated, but only the first is accessed" do
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kw_list = [foo: "bar", foo: "baz"]
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assert kw_list[:foo] == ___
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end
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koan "You could access the values of repeating key" do
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kw_list = [foo: "bar", foo1: "bar1", foo: "baz"]
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values = Keyword.get_values(kw_list, :foo)
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assert List.last(values) == ___
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end
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koan "Keyword lists are just special syntax for lists of two-element tuples" do
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assert [foo: "bar"] == [{___, ___}]
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end
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koan "But unlike maps, the keys in keyword lists must be atoms" do
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not_kw_list = [{"foo", "bar"}]
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assert_raise ArgumentError, fn -> not_kw_list[___] end
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end
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end
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