how enter-update-exit works

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how enter-update-exit works

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Last edited Jun 28, 2018

Created on Jun 25, 2018

Rectangles in an SVG scene enter, update, and exit as the data array randomly changes size every second. The example demonstrates D3 v4’s data join with a key function, using `d3.selectAll("rect").data(data, d => d)` and `d3.transition()` to animate positions and fill-opacity. Entering rectangles drop from y=60 to y=0 in green, updating ones stay red, and exiting ones fall back to y=60 in brown before removal. A linear `d3.scaleLinear` maps values 1–10 to pixel positions along the x-axis.

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