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to Acronym in the PureScript Track

Published at Feb 02 2020 · 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).

Source

Julien Vanier https://github.com/monkbroc

Submitting Incomplete Solutions

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Main.purs

module Test.Main where

import Prelude

import Acronym (abbreviate)
import Effect (Effect)
import Test.Unit (TestSuite, suite, test)
import Test.Unit.Assert as Assert
import Test.Unit.Main (runTest)

main :: Effect Unit
main = runTest suites

suites :: TestSuite
suites = do
  suite "Acronym.abbreviate" do
    test "acronyms from title case" $
      Assert.equal
        "PNG" $
        abbreviate "Portable Networks Graphic"

    test "acronyms from lower case" $
      Assert.equal
        "ROR" $
        abbreviate "Ruby on Rails"

    test "acronyms from inconsistent case" $
      Assert.equal
        "HTML" $
        abbreviate "HyperText Markup Language"

    test "punctuation is ignored" $
      Assert.equal
        "FIFO" $
        abbreviate "First in, First out"

    test "acronyms ignoring punctuation and casing" $
      Assert.equal
        "CMOS" $
        abbreviate "Complementary Metal-Oxide semiconductor"
module Acronym (abbreviate) where

import Data.Array (elemIndex, filter)
import Data.Maybe (fromMaybe)
import Data.String.Common (joinWith, toUpper)
import Data.String.CodeUnits (fromCharArray, toCharArray)
import Data.Char.Unicode (isUpper)
import Data.String.Regex (Regex, split)
import Data.String.Regex.Unsafe (unsafeRegex)
import Data.String.Regex.Flags (global)
import Prelude (map, (==), (||), (<<<), ($))

whitespaceRegex :: Regex
whitespaceRegex = unsafeRegex "\\s" global

uppercaseOrHead :: Array Char -> Char -> Boolean
uppercaseOrHead y x = isUpper x || (fromMaybe 0 $ elemIndex x y) == 0

toLetters :: String -> Array String
toLetters = map fromCharArray <<< map filterUOH <<< map toCharArray <<< split whitespaceRegex
  where filterUOH y = filter (uppercaseOrHead y) y

abbreviate :: String -> String
abbreviate = toUpper <<< joinWith "" <<< toLetters

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