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Contents
defmodule ETL do
@doc """
Transform an index into an inverted index.
## Examples
iex> ETL.transform(%{"a" => ["ABILITY", "AARDVARK"], "b" => ["BALLAST", "BEAUTY"]])
%{"ability" => "a","aardvark" =>"a","ballast" =>"b","beauty" =>"b"]
"""
def transform(input) do
input
|> Map.to_list()
|> invert
|> List.flatten()
|> Enum.into(%{})
end
defp invert(pairs) do
Enum.map(pairs, fn {key, values} ->
Enum.map(values, fn value -> {String.downcase(value), key} end)
end)
end
end
Version data entries
69 entries across 69 versions & 1 rubygems