Chapter 3 Exercises

Section

defmodule Chapter_3 do
  def large_lines!(path) do
    File.stream!(path)
    |> Stream.map(&String.trim_trailing(&1, "\n"))
    |> Enum.filter(&(String.length(&1) > 80))
  end

  def lines_lengths!(path) do
    File.stream!(path)
    |> Stream.map(&String.trim_trailing(&1, "\n"))
    |> Enum.map(&String.length(&1))
  end

  def longest_line_length!(path) do
    File.stream!(path)
    |> Stream.map(&String.trim_trailing(&1, "\n"))
    |> Enum.reduce(0, fn line, longest ->
      if String.length(line) > longest,
        do: longest = String.length(line),
        else: longest
    end)
  end

  def longest_line!(path) do
    File.stream!(path)
    |> Stream.map(&String.trim_trailing(&1, "\n"))
    |> Stream.reduce({"", 0}, fn line, {longest, length} ->
      if String.length(line) > length,
        do: {line, String.length(line)},
        else: {longest, length}
    end)
  end

  def words_per_line!(path) do
    File.stream!(path)
    |> Stream.map(&String.trim_trailing(&1, "\n"))
    |> Stream.map(fn line ->
      length(String.split(line))
    end)
  end
end