Object constancy
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Five fruits sit in a row as colored circles with labels, shifting position when an apple is removed or changed into a lemon. The d3 selection with a key function preserves each fruit’s identity across updates, while `transition().duration()` animates the circle’s radius to zero on exit and slides the remaining fruits to their new slots. `scaleOrdinal` maps fruit type to color and radius, and all rendering uses SVG.
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Exercice : Add transition!
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