This bar chart shows population of the top 10 most populous countries. The data comes from the year 2018 estimate in United Nations: World Population Prospects 2017. It also demonstrates customization of D3 axes.

const titleText = 'Top 10 Most Populous Countries'; const xAxisLabelText = 'Population';

const svg = select('svg');

const width = +svg.attr('width'); const height = +svg.attr('height');

const render = data => { const xValue = d => d['population']; const yValue = d => d.country; const margin = { top: 50, right: 40, bottom: 77, left: 180 }; const innerWidth = width - margin.left - margin.right; const innerHeight = height - margin.top - margin.bottom;

const xScale = scaleLinear() .domain([0, max(data, xValue)]) .range([0, innerWidth]);

const yScale = scaleBand() .domain(data.map(yValue)) .range([0, innerHeight]) .padding(0.1);

const g = svg.append('g') .attr('transform', translate(${margin.left},${margin.top}));

const xAxisTickFormat = number => format('.3s')(number) .replace('G', 'B');

const xAxis = axisBottom(xScale) .tickFormat(xAxisTickFormat) .tickSize(-innerHeight);

g.append('g') .call(axisLeft(yScale)) .selectAll('.domain, .tick line') .remove();

const xAxisG = g.append('g').call(xAxis) .attr('transform', translate(0,${innerHeight}));

xAxisG.select('.domain').remove();

xAxisG.append('text') .attr('class', 'axis-label') .attr('y', 65) .attr('x', innerWidth / 2) .attr('fill', 'black') .text(xAxisLabelText);

g.selectAll('rect').data(data) .enter().append('rect') .attr('y', d => yScale(yValue(d))) .attr('width', d => xScale(xValue(d))) .attr('height', yScale.bandwidth());

g.append('text') .attr('class', 'title') .attr('y', -10) .text(titleText); };

<!DOCTYPE html> <html lang="en"> <head> <script src="https://d3js.org/d3.v4.min.js"></script> </head> <body> <script> // write your d3 code here.. </script> </body> </html>