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Contents
defmodule Garden do
@default_names [
:alice,
:bob,
:charlie,
:david,
:eve,
:fred,
:ginny,
:harriet,
:ileana,
:joseph,
:kincaid,
:larry
]
@letter_map %{"V" => :violets, "R" => :radishes, "C" => :clover, "G" => :grass}
@doc """
Accepts a string representing the arrangement of cups on a windowsill and a
list with names of students in the class. The student names list does not
have to be in alphabetical order.
It decodes that string into the various gardens for each student and returns
that information in a map.
"""
@spec info(String.t(), list) :: map
def info(info_string, student_names \\ @default_names) do
student_names = Enum.sort(student_names)
map = create_map(student_names)
[first_row, second_row] = String.split(info_string, "\n")
populate_map(first_row, second_row, map, student_names)
end
defp create_map(student_names) do
create_map(student_names, %{})
end
defp create_map([], map), do: map
defp create_map([h | t], map) do
map = Map.put(map, h, nil)
create_map(t, map)
end
defp populate_map(_, _, map, []), do: map
defp populate_map(first_row, second_row, map, [current_name | student_names]) do
first_row_letters = String.slice(first_row, 0..1)
second_row_letters = String.slice(second_row, 0..1)
letters = "#{first_row_letters}#{second_row_letters}"
map = add_to_map(map, current_name, letters)
first_row = String.slice(first_row, 2..-1)
second_row = String.slice(second_row, 2..-1)
populate_map(first_row, second_row, map, student_names)
end
defp add_to_map(map, current_name, letters) do
letters = String.codepoints(letters)
translated_list = Enum.map(letters, fn letter -> @letter_map[letter] end)
tuple = List.to_tuple(translated_list)
Map.put(map, current_name, tuple)
end
end
Version data entries
69 entries across 69 versions & 1 rubygems