react-native-ui-lib/src/components/WheelPicker/helpers/useListMiddleIndex.js

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export default ({
  itemHeight,
  listSize
}) => {
  const valueInRange = (value, min, max) => {
    if (value < min || value === -0) {
      return min;
    }
    if (value > max) {
      return max;
    }
    return value;
  };
  const middleIndex = offset => {
    const calculatedIndex = Math.round(offset / itemHeight);
    return valueInRange(calculatedIndex, 0, listSize - 1);
  };
  return middleIndex;
};