exercism/elixir/newsletter/HINTS.md

Hints

1. General

• Read about files in the official Getting Started guide.
• Read about files on joyofelixir.com.
• Take a look at the documentation of the File module.

1. Read email addresses from a file

• There is a built-in function for reading the contents of a file all at once.

2. Open a log file for writing

• There is a built-in function for opening a file.
• The second argument of that function is a list of modes which allows specifying that the file should be opened for writing.

3. Log a sent email

• Functions for reading and writing to a file opened with File.open!/1 can be found in the IO module.
• There is a built-in function for writing a string to a file, followed by a newline.

4. Close the log file

• There is a built-in function for closing a file.

5. Send the newsletter

• All the necessary operations on files were already implemented in the previous steps.
• Before writing to a file, the file must be opened.
• After all write operations to a file finished, the file should be closed.