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D3 Starter_EP

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Eedw.ext@gmail.com
Last edited Oct 4, 2025
Created on Oct 4, 2025

This example demonstrates a React and D3.js bar chart visualizing the frequency of letters in a small CSV dataset. The chart displays each letter on the x-axis with its corresponding count on the y-axis, featuring interactive bars that change color and opacity when clicked to highlight a selected letter. Built with React 19 and D3 v7, the application uses a custom `useDimensions` hook with ResizeObserver for responsive sizing, `d3.scaleBand` and `d3.scaleLinear` for scales, `d3.axisBottom` and `d3.axisLeft` for axes with gridlines, and `d3.csv` for data loading. The code leverages D3's selection `join` method for declarative SVG rendering within the React component lifecycle.

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