B b of Bowl of Fruit - General Update Pattern
This example demonstrates the general update pattern in D3.js by rendering a bowl of fruit as circles that appear, disappear, and change properties. It uses `d3.scaleOrdinal` to map fruit types to colors and radii, with apple (red, larger) and lemon (yellow, smaller) as the data points. The `selection.enter`, `merge`, and `exit` methods manage the circles, while the initial view shows five apples and removes one, illustrating the update cycle with SVG rendering and a D3 v5 bundle.