This example demonstrates the fundamental D3 data-join pattern by explicitly separating enter, update, and exit selections for a set of objects. The code initializes an SVG canvas with a color scale and an empty array of objects, then defines a render function that handles the three states, though the specific visual behavior is left as a template exercise. Using d3.scaleOrdinal and d3.range, it sets up the scaffolding for binding data to SVG elements, with placeholder functions for adding and updating objects. The example serves as a workshop template for understanding how D3’s enter, update, and exit selections drive dynamic visualizations.