FizzBuzz solutions in JavaScript and Elm.

fizzbuzz-1.js

// JavaScript
const fizzAndOrNotBuzz = i => {
    switch(true) {
        case i % 15 === 0: return 'FizzBuzz'
        case i % 5 === 0: return 'Buzz'
        case i % 3 === 0: return 'Fizz'
        default: return i
    }
}

Array(100)
.fill(0)
.map( (_, index) => index + 1 )
.map( item => fizzAndOrNotBuzz(item) )
.map( item => console.log(item) )

fizzbuzz-2.elm

module Main exposing (main)

import Browser
import Html exposing (Html, button, div, text, textarea)
import Html.Attributes exposing (cols, rows)
import Html.Events exposing (onClick)
import List exposing (foldl, indexedMap, map, repeat)
import String exposing (toInt)


type alias Model =
    { result : String }


fizzAndOrNotBuzz : Int -> String
fizzAndOrNotBuzz i =
    if modBy 15 i == 0 then"FizzBuzz"
    else if modBy 5 i == 0 then "Buzz"
    else if modBy 3 i == 0 then "Fizz"
    else String.fromInt i

doFizzBuzz : String
doFizzBuzz =
    repeat 100 1
    |> indexedMap (\item index -> item + index)
    |> map fizzAndOrNotBuzz
    |> foldl (\item acc -> acc ++ item ++ "\n") ""


initialModel : Model
initialModel =
    { result = "Ready?" }


type Msg
    = PassInterview


update : Msg -> Model -> Model
update msg model =
    case msg of
        PassInterview ->
            { model | result = doFizzBuzz }


view : Model -> Html Msg
view model =
    div []
        [ button [ onClick PassInterview ] [ text "Pass Interview" ]
        , textarea [ rows 4, cols 50 ] [ text model.result ]
        ]


main : Program () Model Msg
main =
    Browser.sandbox
        { init = initialModel
        , view = view
        , update = update
        }