D3: Simple Bar Chart code

gistfile1.js

// Array of data
var dataSet = [ 8, 48, 14, 31, 23 ];

// SVG container
svg = d3.select('body').append('svg').attr({
    width: 600,
    height: 400
});

// SVG Elements
svg.selectAll('rect')   // Select all elements (rectangles); empty selection
    .data(dataSet)      // Bind data to selection(s), elements
    .enter()            // Returns placeholders for missing elements; does not create elements
    .append('rect')     // Create missing elements with 'append'
    .attr({
        x: function(d, i) { return i * 101; },          // 'd' data; 'i' position in dataSet
        y: function(d, i) { return 400 - (d * 5); },
        width: 100,
        height: function(d) { return d * 5; },
        fill: 'orange'
    });