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paulfioravanti's solution

to Acronym in the Elixir Track

Published at Aug 08 2019 · 0 comments
Test suite


This exercise has changed since this solution was written.

Convert a phrase to its acronym.

Techies love their TLA (Three Letter Acronyms)!

Help generate some jargon by writing a program that converts a long name like Portable Network Graphics to its acronym (PNG).

Running tests

Execute the tests with:

$ mix test

Pending tests

In the test suites, all but the first test have been skipped.

Once you get a test passing, you can unskip the next one by commenting out the relevant @tag :pending with a # symbol.

For example:

# @tag :pending
test "shouting" do
  assert Bob.hey("WATCH OUT!") == "Whoa, chill out!"

Or, you can enable all the tests by commenting out the ExUnit.configure line in the test suite.

# ExUnit.configure exclude: :pending, trace: true

If you're stuck on something, it may help to look at some of the available resources out there where answers might be found.


Julien Vanier https://github.com/monkbroc

Submitting Incomplete Solutions

It's possible to submit an incomplete solution so you can see how others have completed the exercise.


defmodule AcronymTest do
  use ExUnit.Case

  test "it produces acronyms from title case" do
    assert Acronym.abbreviate("Portable Networks Graphic") === "PNG"

  @tag :pending
  test "it produces acronyms from lower case" do
    assert Acronym.abbreviate("Ruby on Rails") === "ROR"

  @tag :pending
  test "it produces acronyms from inconsistent case" do
    assert Acronym.abbreviate("HyperText Markup Language") === "HTML"

  @tag :pending
  test "it ignores punctuation" do
    assert Acronym.abbreviate("First in, First out") === "FIFO"

  @tag :pending
  test "it produces acronyms ignoring punctuation and casing" do
    assert Acronym.abbreviate("Complementary Metal-Oxide semiconductor") === "CMOS"


ExUnit.configure(exclude: :pending, trace: true)
defmodule Acronym do
  @character_after_acronym_target ~r/
    (?!     # negative lookahead - after asserting that what follows the
            # current position is not:
      \b\w  # 1. a border character then a letter
      |     # or
      [A-Z] # 2. a capital letter
    )       # (ie an acronym target)
    .       # match any single character

  @doc """
  Generate an acronym from a string.
  "This is a string" => "TIAS"
  @spec abbreviate(String.t()) :: String.t()
  def abbreviate(string) do
    |> String.replace(@character_after_acronym_target, "")
    |> String.upcase()

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