Avatar of paulfioravanti

paulfioravanti's solution

to Acronym in the Elm Track

Published at Aug 09 2019 · 0 comments
Instructions
Test suite
Solution

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).

Elm Installation

Refer to the Installing Elm page for information about installing elm.

Writing the Code

The first time you start an exercise, you'll need to ensure you have the appropriate dependencies installed. Thankfully, Elm makes that easy for you and will install dependencies when you try to run tests or build the code.

Execute the tests with:

$ elm-test

Automatically run tests again when you save changes:

$ elm-test --watch

As you work your way through the test suite, be sure to remove the skip <| calls from each test until you get them all passing!

Source

Julien Vanier https://github.com/monkbroc

Submitting Incomplete Solutions

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

Tests.elm

module Tests exposing (tests)

import Acronym exposing (abbreviate)
import Expect
import Test exposing (Test, describe, skip, test)


tests : Test
tests =
    describe "Acronym"
        [ test "basic" <|
            \_ ->
                Expect.equal "PNG"
                    (abbreviate "Portable Network Graphics")
        , skip <|
            test "lowercase words" <|
                \_ ->
                    Expect.equal "ROR"
                        (abbreviate "Ruby on Rails")
        , skip <|
            test "punctuation" <|
                \_ ->
                    Expect.equal "FIFO"
                        (abbreviate "First In, First Out")
        , skip <|
            test "all caps word" <|
                \_ ->
                    Expect.equal "GIMP"
                        (abbreviate "GNU Image Manipulation Program")
        , skip <|
            test "punctuation without whitespace" <|
                \_ ->
                    Expect.equal "CMOS"
                        (abbreviate "Complementary metal-oxide semiconductor")
        ]
module Acronym exposing (abbreviate)

import Regex


abbreviate : String -> String
abbreviate phrase =
    let
        characterAfterAcronymTarget =
            {- negative lookahead - after asserting that what follows the
               current position is not a border character then a letter
               (ie an acronym target), match any single character
            -}
            "(?!\\b\\w)."
                |> Regex.fromString
                |> Maybe.withDefault Regex.never
    in
    phrase
        |> Regex.replace characterAfterAcronymTarget (always "")
        |> String.toUpper

Community comments

Find this solution interesting? Ask the author a question to learn more.

What can you learn from this solution?

A huge amount can be learned from reading other people’s code. This is why we wanted to give exercism users the option of making their solutions public.

Here are some questions to help you reflect on this solution and learn the most from it.

  • What compromises have been made?
  • Are there new concepts here that you could read more about to improve your understanding?