CurrentIndex - React Hook

Counter.js

const App = () => {
  const { container } = styles
  const [currentIndex, setCurrentIndex] = useState(0)

  const array = [{ title: "Today" }, { title: "Week" }, { title: "Month" }]
  return (
    <View style={container}>
      <Text>{${currentIndex}}</Text>
      {array.map(({ title }, i) => (
        <TouchableOpacity key={title} onPress={() => setCurrentIndex(i)}>
          <Text>{title}</Text>
        </TouchableOpacity>
      ))}
    </View>
  )
}