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Update StackBasedNavigation.md #2475

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Sep 22, 2023
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Update StackBasedNavigation.md #2475

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8 changes: 4 additions & 4 deletions Sources/ComposableArchitecture/Documentation.docc/Articles/StackBasedNavigation.md
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Original file line number Diff line number Diff line change
Expand Up @@ -429,7 +429,7 @@ use the `XCTModify` helper:

```swift
await store.send(.path(.element(id: 0, action: .incrementButtonTapped))) {
XCTModify(&$0[id: 0], case: /Feature.Path.State.counter) {
XCTModify(&$0.path[id: 0], case: /Feature.Path.State.counter) {
$0.count = 4
}
}
Expand All @@ -439,15 +439,15 @@ The `XCTModify` function takes an `inout` piece of enum state as its first argum
path for its second argument, and then uses the case path to extract the payload in that case,
allow you to perform a mutation to it, and embed the data back into the enum. So, in the code
above we are subscripting into ID 0, isolating the `.counter` case of the `Path.State` enum,
and mutating the `count` to be 4 since it incremented by one. Further, if the case of `$0[id: 0]`
and mutating the `count` to be 4 since it incremented by one. Further, if the case of `$0.path[id: 0]`
didn't match the case path, then a test failure would be emitted.

Another option is to use ``StackState/subscript(id:case:)`` to simultaneously subscript into an
ID on the stack _and_ a case of the path enum:

```swift
await store.send(.path(.element(id: 0, action: .incrementButtonTapped))) {
$0[id: 0, case: /Feature.Path.State.counter]?.count = 4
$0.path[id: 0, case: /Feature.Path.State.counter]?.count = 4
}
```

Expand All @@ -458,7 +458,7 @@ Continuing with the test, we can send it one more time to see that the count goe

```swift
await store.send(.path(.element(id: 0, action: .incrementButtonTapped))) {
XCTModify(&$0[id: 0], case: /Feature.Path.State.counter) {
XCTModify(&$0.path[id: 0], case: /Feature.Path.State.counter) {
$0.count = 5
}
}
Expand Down