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to Acronym in the Elm Track

Published at Aug 09 2019 · 0 comments
Test suite

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!


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.


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 =
        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
                |> Regex.fromString
                |> Maybe.withDefault Regex.never
        |> Regex.replace characterAfterAcronymTarget (always "")
        |> String.toUpper

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