This example demonstrates how to create categorical color legends and quantitative size legends using D3.js v5’s `scaleOrdinal` and `scaleSqrt` APIs. The color legend maps fruit names to distinct hues, while the size legend encodes numeric values through circle radii using a square root transformation, with tick marks generated from the scale’s `ticks` method. Both legends are rendered as SVG groups containing circles and text, using the nested general update pattern to handle enter/update/exit transitions efficiently.