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Update Chapter 6's vestigial "previous chapter" references to Chapter 4 #478

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Update Chapter 6's vestigial "previous chapter" references to Chapter 4 #478

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976f7ea
correct 'previous chapter' references
JamesKoenig Nov 20, 2025
425a55f
fix over-deletion typo
JamesKoenig Nov 20, 2025
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6 changes: 3 additions & 3 deletions text/chapter6.md
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Expand Up @@ -167,7 +167,7 @@ Type class instances can be defined in one of two places: in the same module tha

## Exercises

1. (Easy) Define a `Show` instance for `Point`. Match the same output as the `showPoint` function from the previous chapter. _Note:_ Point is now a `newtype` (instead of a `type` synonym), which allows us to customize how to `show` it. Otherwise, we'd be stuck with the default `Show` instance for records.
1. (Easy) Define a `Show` instance for `Point`. Match the same output as the `showPoint` function from chapter 4. _Note:_ Point is now a `newtype` (instead of a `type` synonym), which allows us to customize how to `show` it. Otherwise, we'd be stuck with the default `Show` instance for records.

```haskell
{{#include ../exercises/chapter6/test/no-peeking/Solutions.purs:Point}}
Expand Down Expand Up @@ -372,13 +372,13 @@ The following newtype represents a complex number:

4. (Easy) Derive (via `newtype`) a `Ring` instance for `Complex`. _Note_: You may instead write this instance manually, but that's not as convenient.

Here's the `Shape` ADT from the previous chapter:
Here's the `Shape` ADT from chapter 4:

```haskell
{{#include ../exercises/chapter6/test/no-peeking/Solutions.purs:Shape}}
```

5. (Medium) Derive (via `Generic`) a `Show` instance for `Shape`. How does the amount of code written and `String` output compare to `showShape` from the previous chapter? _Hint_: See the [Deriving from `Generic`](https://github.com/purescript/documentation/blob/master/guides/Type-Class-Deriving.md#deriving-from-generic) section of the [Type Class Deriving](https://github.com/purescript/documentation/blob/master/guides/Type-Class-Deriving.md) guide.
5. (Medium) Derive (via `Generic`) a `Show` instance for `Shape`. How does the amount of code written and `String` output compare to `showShape` from chapter 4? _Hint_: See the [Deriving from `Generic`](https://github.com/purescript/documentation/blob/master/guides/Type-Class-Deriving.md#deriving-from-generic) section of the [Type Class Deriving](https://github.com/purescript/documentation/blob/master/guides/Type-Class-Deriving.md) guide.

## Type Class Constraints

Expand Down