General Update Pattern

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General Update Pattern

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Last edited Aug 14, 2019

Created on Aug 14, 2019

This example demonstrates the general update pattern in D3.js, showing how data joins handle enter, update, and exit selections. A row of apples is drawn as SVG circles with labels, then undergoes timed changes: removing the last fruit, replacing an apple with a lemon, and filtering out an item. The `fruitBowl.js` module uses `scaleOrdinal` for color and radius, while `index.js` orchestrates state changes with `setTimeout`. Each render call invokes `selection.selectAll` and `.data()`, applying enter/merge/exit operations for both circles and text elements.

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Demonstrates fundamental DOM manipulation using D3.js by making a smiley face whose eyebrows move.

MIT Licensed

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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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