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chore: added update-pattern on how to replace & bulk update (nested) objects #1131

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chore: added update-pattern on how to replace & bulk update (nested) objects #1131

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f9c3113
Add an update pattern that explains how to replace & update objects i…
matt-miro Jun 25, 2024
b45d921
Changed the body for the third todo
matt-miro Jun 25, 2024
7671d8e
Updated note with input from Mark Erikson
matt-miro Jun 25, 2024
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11 changes: 11 additions & 0 deletions website/docs/update-patterns.md
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Original file line number Diff line number Diff line change
Expand Up @@ -35,8 +35,19 @@ const deletedTodosObj = produce(todosObj, draft => {
const updatedTodosObj = produce(todosObj, draft => {
draft["id1"].done = true
})

// replace & update in bulk
const updatedTodosObj = produce(todosObj, draft => {
Object.assign(draft, {
id1: {done: true, body: "Take out the trash"},
id2: {done: true, body: "Check Email"},
id3: {done: true, body: "Feed my cat"}
})
})
```

Any time a nested draft field gets a new reference or value, produce() will finish applying the immutable update and return a new reference. If you tried to mutate, but the values remained the same, Immer will bail out and return the existing reference from produce()

### Array mutations

```javascript
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