This example demonstrates the general update pattern in D3, showing how data joins handle entering, updating, and exiting elements. It renders a row of fruit as SVG circles, with apples and lemons distinguished by a `scaleOrdinal` color scale and radius scale. The code uses `selection.data()` with a key function, then applies transitions to animate new circles scaling up from radius zero, existing ones updating position and size, and removed fruits shrinking away before being deleted. The animation is driven by `setTimeout` calls that modify the fruit array and re-render.