This example demonstrates how to construct separate color and size legends for ordinal and quantitative scales. The color legend maps categorical fruit names to distinct colors using `scaleOrdinal`, while the size legend uses `scaleSqrt` with `ticks` to display five circle radii. Both legends are built with reusable functions that append SVG `<g>` groups, circles, and text elements. The code uses D3 v5 APIs including `selection.call`, `selection.merge`, and `selection.exit` to update legend components dynamically.