General update pattern

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General update pattern

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Last edited Apr 7, 2020

Created on Apr 7, 2020

This example demonstrates the general update pattern for animated transitions in D3.js visualizations. A fruit bowl graphic shows a row of apples and lemons as colored circles, with changes occurring over time as fruits are removed, replaced, and filtered from the dataset. The implementation uses D3 v5’s selection merging and exit/enter methods within a React framework, rendered as SVG elements. The `fruitBowl` function applies ordinal color and radius scales to map fruit types to visual properties, while the main script manipulates the fruit array with setTimeout calls to trigger the update pattern.

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The example demonstrates the D3 general update pattern, animating a row of fruit circles as apples are added, removed, and replaced with lemons over time. It uses d3.select and d3.range to manage data, and the fruitBowl module applies enter, merge, and exit selections with transition.attr to animate circle radius and fill color. Rendering occurs in SVG via a React-free vanilla JavaScript setup, with d3.scaleOrdinal mapping fruit types to colors and sizes. The data consists of a mutable array of fruit objects, each with a random id for keying.

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