<!-- BEGIN COPY / PASTE -->
    import React, { useMemo, useCallback } from 'react';

    function MyComponent({ items }) {
      const computedValue = useMemo(() => {
        return items.reduce((acc, item) => acc + item.value, 0);
      }, [items]);

      const handleClick = useCallback(() => {
        console.log('Button clicked');
      }, []);

      return (
        <div>
          <p>Computed Value: {computedValue}</p>
          <button onClick={handleClick}>Click Me</button>
        </div>
      );
    }
    <!-- END COPY / PASTE -->