Why hook useMemo is used in useBottomSheetDynamicSnapPoints example?

[MOTORIST]

import React from 'react';
import BottomSheet, {
  useBottomSheetDynamicSnapPoints,
} from '@gorhom/bottom-sheet';

const App = () => {
  const initialSnapPoints = useMemo(() => ['25%', 'CONTENT_HEIGHT'], []);

  const {
    animatedHandleHeight,
    animatedSnapPoints,
    animatedContentHeight,
    handleContentLayout,
  } = useBottomSheetDynamicSnapPoints(initialSnapPoints);

  return (
    //... other views
    <BottomSheet
      ref={bottomSheetRef}
      snapPoints={animatedSnapPoints}
      handleHeight={animatedHandleHeight}
      contentHeight={animatedContentHeight}
    >
      <BottomSheetView
        style={contentContainerStyle}
        onLayout={handleContentLayout}
      >
        //... views to be measured
      </BottomSheetView>
    </BottomSheet>
    //... other views
  );
};