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Update part5b.md forwardRef #4034

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Update part5b.md forwardRef #4034

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12 changes: 7 additions & 5 deletions src/content/5/en/part5b.md
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Original file line number Diff line number Diff line change
Expand Up @@ -388,9 +388,9 @@ The [useRef](https://react.dev/reference/react/useRef) hook is used to create a
We also make the following changes to the <i>Togglable</i> component:

```js
import { useState, forwardRef, useImperativeHandle } from 'react' // highlight-line
import { useState, useImperativeHandle } from 'react' // highlight-line

const Togglable = forwardRef((props, refs) => { // highlight-line
const Togglable = (props) => { // highlight-line
const [visible, setVisible] = useState(false)

const hideWhenVisible = { display: visible ? 'none' : '' }
Expand All @@ -401,7 +401,7 @@ const Togglable = forwardRef((props, refs) => { // highlight-line
}

// highlight-start
useImperativeHandle(refs, () => {
useImperativeHandle(props.ref, () => {
return {
toggleVisibility
}
Expand All @@ -419,12 +419,14 @@ const Togglable = forwardRef((props, refs) => { // highlight-line
</div>
</div>
)
}) // highlight-line
} // highlight-line

export default Togglable
```

The function that creates the component is wrapped inside of a [forwardRef](https://react.dev/reference/react/forwardRef) function call. This way the component can access the ref that is assigned to it.
The reference assigned to the component can be accessed as a prop using `props.ref`.

**NOTE:** Before React 19 the function that creates the component was supposed to be wrapped inside of a [forwardRef](https://react.dev/reference/react/forwardRef) function call to enable the component to access the ref assigned to it, that is no longer required, as it's now possible to access the ref as a prop.

The component uses the [useImperativeHandle](https://react.dev/reference/react/useImperativeHandle) hook to make its <i>toggleVisibility</i> function available outside of the component.

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