import React, { useState, useCallback, useEffect, } from 'react'; import ReactDOM from 'react-dom'; import { csv, arc, pie, scaleBand, scaleLinear, max, format, } from 'd3'; import { useData } from './useData'; import { AxisBottom } from './AxisBottom'; import { AxisLeft } from './AxisLeft'; import { Marks } from './Marks'; const width = 960; const height = 500; const margin = { top: 20, right: 30, bottom: 65, left: 220, }; const xAxisLabelOffset = 50; const App = () => { const data = useData(); if (!data) { return

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; } const innerHeight = height - margin.top - margin.bottom; const innerWidth = width - margin.left - margin.right; const yValue = (d) => d.Country; const xValue = (d) => d.Population; const siFormat = format('.2s'); const xAxisTickFormat = (tickValue) => siFormat(tickValue).replace('G', 'B'); const yScale = scaleBand() .domain(data.map(yValue)) .range([0, innerHeight]) .paddingInner(0.15); const xScale = scaleLinear() .domain([0, max(data, xValue)]) .range([0, innerWidth]); return ( ); }; const rootElement = document.getElementById('root'); ReactDOM.render(, rootElement);

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