Cookbooks
Elm
Chapter 2. Strings
Capitalizing a string

Elm:
Capitalizing a string

How to:

In Elm, there isn’t a built-in function specifically for capitalizing strings. However, you can achieve this easily by using the built-in String module functions like toUpper, toLower, left, and dropLeft.

capitalize : String -> String
capitalize str =
    if String.isEmpty str then
        ""
    else
        String.toUpper (String.left 1 str) ++ String.toLower (String.dropLeft 1 str)

-- Example usage
main =
    String.toList "hello world" |> List.map capitalize |> String.join " "
    -- Output: "Hello World"

For more complex scenarios or if you prefer using a library that provides a direct way to capitalize strings, you might consider a third-party package such as elm-community/string-extra. However, as of my last update, Elm’s ecosystem encourages dealing with such tasks using built-in functions to keep the language and projects lean.

import String.Extra as StringExtra

-- In case there's a `capitalize` function in a third-party library
capitalizeWithLibrary : String -> String
capitalizeWithLibrary str =
    StringExtra.capitalize str

-- Example usage with hypothetical library function
main =
    "this is elm" |> capitalizeWithLibrary
    -- Hypothetical output: "This is elm"

Always check the Elm package repository for the latest and most preferred libraries for string manipulation if you’re looking for additional functionality beyond the standard library.

Concatenating strings