This example demonstrates two reusable legend components for D3 v5: a color legend using an ordinal scale mapping fruit names to colors, and a size legend using a square-root scale with five ticks. Both render as SVG groups with circles and text labels, positioned via transforms. The colorLegend component encodes categorical data with colored circles, while the sizeLegend uses scaled circle radii and offsets text based on each value’s radius. The code imports `scaleOrdinal` and `scaleSqrt` from D3, and uses selection joins to update or remove legend items dynamically.