oldfartdeveloper

Here's the code as part of a coding exercise (the 2nd one) here:

module CartesianProductExercise where
  
import Prelude

import Data.Tuple (Tuple(..))

oldfartdeveloper

Introduction

This exercise shouldn't have been that challenging, but it stumped me. Here's my woeful journey with the path through it so that I can review my approach when I get stuck on the next exercise.

The Exercise

Found in the Purescript Book, exercise 2:

(Medium) Write a function possibleSums which uses foldM to determine all possible totals that could be made using a set of coins. The coins will be specified as an array which contains the value of each coin. Your function should have the following result: >

oldfartdeveloper

PureScript: using newtype with records

I ran into a beginner mistake that I was unable to figure out. So I posted to PureScript Discord and the conversation quickly showed me not only why what I did didn't work, but suggestions for how to fix it specifically. Kudos to @monoidmusician and @natefabion. Here's the discussion:

me

I have a compiler error that I'm just not understanding why it's happening: Here's the test code:

module Foo where