Capitalize in Elixir

Published on 28 April 2022 (Updated: 18 September 2022)

Capitalize in Elixir

Welcome to the Capitalize in Elixir page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

defmodule Capitalize do

    @doc """
    Capitalize the fitst entry of a list of strings and return the list as a single string.
    Return an error-string if the list is empty.

    Three cases of command line arguments:
        1. No argument / empty string -> return error string
        2. Single quoted string -> Assume fist word starts at index 0, capitalize first letter
        3. Multiple strings/words -> capitalize first word
    """
    def main([]) do "Usage: please provide a string" end
    def main([ "" | []]) do "Usage: please provide a string" end

    def main([ head | [] ]) do
        capitalize_word(head)
    end

    def main( [head | tail] ) do
        [ capitalize_word(head) | tail] |> Enum.join(" ") 
    end

    defp capitalize_word(word) do
        first_letter = String.first(word)
        first_letter_up = String.capitalize(first_letter)
        String.replace_prefix(word, first_letter, first_letter_up)
    end
end

Capitalize.main(System.argv()) |> IO.puts

Capitalize in Elixir was written by:

If you see anything you'd like to change or update, please consider contributing.

How to Implement the Solution

No 'How to Implement the Solution' section available. Please consider contributing.

How to Run the Solution

No 'How to Run the Solution' section available. Please consider contributing.