Lesson 4: Design Pattern

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Lesson 4: Design Pattern

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Last edited Aug 5, 2020

Created on Feb 23, 2020

Forked from Lesson 3

This example demonstrates the design pattern of using a single SVG element to render and update a data-driven visualization with animated transitions. It shows a bowl of fruit, represented by colored circles, where an apple is converted to a lemon and a fruit is removed over time, illustrating how D3’s data join, along with `selection.enter()` and `selection.exit()`, manages dynamic updates. The code uses `d3.scaleOrdinal` and `d3.scaleLinear` to map fruit types to sizes and positions, and leverages `transition().delay()` for animated attribute changes. The visualization is built with D3 v5 within a React framework, rendering to SVG with a population dataset from the World Bank.

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