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Implement wrap-around functionality for sculpture gallery navigation #8635

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Implement wrap-around functionality for sculpture gallery navigation #8635

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40 changes: 34 additions & 6 deletions src/content/learn/state-a-components-memory.md
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Original file line number Diff line number Diff line change
Expand Up @@ -193,12 +193,20 @@ const [index, setIndex] = useState(0);
This is how they work together in `handleClick`:

```js
const hasNext = index < sculptureList.length - 1;

function handleClick() {
setIndex(index + 1);
if (hasNext) {
setIndex(index + 1);
} else {
setIndex(0);
}
}
```

Now clicking the "Next" button switches the current sculpture:
The `hasNext` check circles back to the first sculpture after the last one.

Now clicking the "Next" button switches the current sculpture, wrapping around to the first one after the last:

<Sandpack>

Expand All @@ -208,9 +216,14 @@ import { sculptureList } from './data.js';

export default function Gallery() {
const [index, setIndex] = useState(0);
const hasNext = index < sculptureList.length - 1;

function handleClick() {
setIndex(index + 1);
if (hasNext) {
setIndex(index + 1);
} else {
setIndex(0);
}
}

let sculpture = sculptureList[index];
Expand Down Expand Up @@ -392,9 +405,14 @@ import { sculptureList } from './data.js';
export default function Gallery() {
const [index, setIndex] = useState(0);
const [showMore, setShowMore] = useState(false);
const hasNext = index < sculptureList.length - 1;

function handleNextClick() {
setIndex(index + 1);
if (hasNext) {
setIndex(index + 1);
} else {
setIndex(0);
}
}

function handleMoreClick() {
Expand Down Expand Up @@ -573,9 +591,14 @@ function Gallery() {
// Each useState() call will get the next pair.
const [index, setIndex] = useState(0);
const [showMore, setShowMore] = useState(false);
const hasNext = index < sculptureList.length - 1;

function handleNextClick() {
setIndex(index + 1);
if (hasNext) {
setIndex(index + 1);
} else {
setIndex(0);
}
}

function handleMoreClick() {
Expand Down Expand Up @@ -757,9 +780,14 @@ import { sculptureList } from './data.js';
export default function Gallery() {
const [index, setIndex] = useState(0);
const [showMore, setShowMore] = useState(false);
const hasNext = index < sculptureList.length - 1;

function handleNextClick() {
setIndex(index + 1);
if (hasNext) {
setIndex(index + 1);
} else {
setIndex(0);
}
}

function handleMoreClick() {
Expand Down
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