onPrevStart

`onPrevStart` will pass both the current and next `item-object`:

(currentItem, nextItem) => {/*...*/}

The item-object has the shape of:

{
    item: {/* your item */},
    index: // the item's index number 
}

<Carousel
  initialActiveIndex={3}
  itemsToShow={2}
  onPrevStart={(currentItem, nextItem) =>
    alert(JSON.stringify(currentItem) + `\n` + JSON.stringify(nextItem))
  }
>
  <Item someProp="cool1">1</Item>
  <Item someProp="cool2">2</Item>
  <Item someProp="cool3">3</Item>
  <Item someProp="cool4">4</Item>
  <Item someProp="cool5">5</Item>
  <Item someProp="cool6">6</Item>
</Carousel>

<Carousel
  initialActiveIndex={3}
  itemsToShow={2}
  onPrevStart={(currentItem, nextItem) =>
    alert(JSON.stringify(currentItem) + `\n` + JSON.stringify(nextItem))
  }
>
  <Item someProp="cool1">1</Item>
  <Item someProp="cool2">2</Item>
  <Item someProp="cool3">3</Item>
  <Item someProp="cool4">4</Item>
  <Item someProp="cool5">5</Item>
  <Item someProp="cool6">6</Item>
</Carousel>

onPrevStart

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`onPrevStart` will pass both the current and next `item-object`: