exercism/elixir/high-school-sweetheart

High School Sweetheart

Welcome to High School Sweetheart on Exercism's Elixir Track. If you need help running the tests or submitting your code, check out HELP.md. If you get stuck on the exercise, check out HINTS.md, but try and solve it without using those first :)

Introduction

Strings

Strings in Elixir are delimited by double quotes, and they are encoded in UTF-8:

"Hi!"

Strings can be concatenated using the <>/2 operator:

"Welcome to" <> " " <> "New York"
# => "Welcome to New York"

Strings in Elixir support interpolation using the #{} syntax:

"6 * 7 = #{6 * 7}"
# => "6 * 7 = 42"

To put a newline character in a string, use the \n escape code:

"1\n2\n3\n"

To comfortably work with texts with a lot of newlines, use the triple-double-quote heredoc syntax instead:

"""
1
2
3
"""

Elixir provides many functions for working with strings in the String module.

Pipe Operator

The |> operator is called the pipe operator. It can be used to chain function calls together in such a way that the value returned by the previous function call is passed as the first argument to the next function call.

"hello"
|> String.upcase()
|> Kernel.<>("?!")
# => "HELLO?!"

Instructions

In this exercise, you are going to help high school sweethearts profess their love on social media by generating an ASCII heart with their initials:

     ******       ******
   **      **   **      **
 **         ** **         **
**            *            **
**                         **
**     J. K.  +  M. B.     **
 **                       **
   **                   **
     **               **
       **           **
         **       **
           **   **
             ***
              *

1. Get the name's first letter

Implement the HighSchoolSweetheart.first_letter/1 function. It should take a name and return its first letter. It should clean up any unnecessary whitespace from the name.

HighSchoolSweetheart.first_letter("Jane")
# => "J"

2. Format the first letter as an initial

Implement the HighSchoolSweetheart.initial/1 function. It should take a name and return its first letter, uppercase, followed by a dot. Make sure to reuse HighSchoolSweetheart.first_letter/1 that you defined in the previous step.

HighSchoolSweetheart.initial("Robert")
# => "R."

3. Split the full name into the first name and the last name

Implement the HighSchoolSweetheart.initials/1 function. It should take a full name, consisting of a first name and a last name separated by a space, and return the initials. Make sure to reuse HighSchoolSweetheart.initial/1 that you defined in the previous step.

HighSchoolSweetheart.initials("Lance Green")
# => "L. G."

4. Put the initials inside of the heart

Implement the HighSchoolSweetheart.pair/2 function. It should take two full names and return the initials inside an ASCII heart. Make sure to reuse HighSchoolSweetheart.initials/1 that you defined in the previous step.

HighSchoolSweetheart.pair("Blake Miller", "Riley Lewis")
# => """
#      ******       ******
#    **      **   **      **
#  **         ** **         **
# **            *            **
# **                         **
# **     B. M.  +  R. L.     **
#  **                       **
#    **                   **
#      **               **
#        **           **
#          **       **
#            **   **
#              ***
#               *
# """

Source

Created by

• @angelikatyborska

Contributed to by

• @neenjaw