Elm Format Number

This simple Elm package formats float numbers as pretty strings:

import FormatNumber exposing (format)
import FormatNumber.Locales exposing (spanishLocale)

format spanishLocale (pi * 1000)  -- "3.141,59"

It is flexible enough to deal with different number of decimals, different thousand separators and diffetent decimal separator. It has a couple os predefined Locale but you can edit them or create your own:

import FormatNumber exposing (format)
import FormatNumber.Locales exposing (Locale)

myLocale : Locale
myLocale =
    { decimals = 4
    , thousandSeparator = " "
    , decimalSeparator = "."
    }
    
sharesLocale : Locale
sharesLocale = { myLocale | decimals = 3 }

format myLocale (pi * 1000) -- "3 141.5926"
format sharesLocale (pi * 1000) -- "3 141.593"

The API is further documented in package.elm-lang.org.

Tests

This package uses elm-doc-test, all the exemples in the documentation are automatically tested:

$ yarn install
$ yarn test