flip arguments to Elm function call

Question

I am trying to modify the Elm example that shows a single spacer so that it renders multiple spacers of different colors:

import Color exposing (red, blue, yellow)
import Graphics.Element exposing (Element, color, spacer, flow, right)


colors = [ yellow, red, blue ]

presentColors : List Element
presentColors = List.map (color ??? (spacer 30 30)) colors

main : Element
main =
  flow right presentColors

However as you can see the function color takes the color argument first and so I cannot create a partially applied version of it for List.map to use.

So how can I flip the arguments to color so that it can be partially applied?

Answer 1

As of Elm 0.19, flip is no longer included by default. The docs recommend named helper functions instead.

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Go to the Elm (pre v0.19) libraries page. Press Standard Libraries. In the search box, type in flip and click the function that comes up. That'll give you the documentation for

flip : (a -> b -> c) -> b -> a -> c
Flip the order of the first two arguments to a function.

With which you can do

flip color (spacer 30 30)

which is the same thing as

\c -> color c (spacer 30 30)

Answer 2

Flip was removed from elm/core in 0.19. You could try:
pilatch/flip package instead.