General Update Pattern

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General Update Pattern

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Last edited Jan 21, 2020

Created on Jan 21, 2020

This example demonstrates the D3 general update pattern with React, using a row of fruit shapes that change over time. It shows how data joins handle enter, update, and exit selections as apples are eaten and replaced by lemons. The code uses `selection.data()` with a key function, `.enter()`, `.merge()`, and `.exit()` to manage SVG groups, circles, and text elements. D3’s `scaleOrdinal` maps fruit types to colors and radii, while `setTimeout` triggers state changes to the fruit array.

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General Update pattern

This example demonstrates the general update pattern in D3.js, showing how data joins handle enter, update, and exit selections. A row of fruit circles—apples and a bitter lemon—change over time as items are removed or modified, with each circle’s fill and radius determined by a `scaleOrdinal`. The React-like component `fruitBowl` uses `selection.selectAll()` and `.merge()` to update SVG circles and text on each render, triggered by `setTimeout` callbacks. Transitions are commented out, so updates apply instantly without animation.

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