D3 Examples - simple scatterplot

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>
​
<body>
  <script>
    // Feel free to change or delete any of the code you see in this editor!
    var data = [{x:17, y:61},
               {x:19, y:25},
               {x:26, y:22},
               {x:39, y:31},
               {x:34, y:26},
               {x:25, y:47},
               {x:14, y:34}]
    
    var x_scale = d3.scaleLinear().domain([0,98]).range([20,400])
    
    var y_scale = d3.scaleLinear().domain([0,157]).range([400,20])
    
    var xAxis= d3.axisBottom()
            .scale(x_scale)
    
    var yAxis = d3.axisLeft()
            .scale(y_scale)
    
    var svg = d3.select("body").append("svg")
      .attr("width", 960)
      .attr("height", 500)
​
    
    
    svg.selectAll('circle')
    .data(data)
    .enter().append('circle') //this creates the circles
    // .attr('cx',(d,i) ==> console.log
    //.attr('cx',d=>d.x)
    .attr('cx',d=>x_scale(d.x))
    //equivalent to cx, function(d,i) {
    //              console.log(d,i);
    //              return d.x })
    //.attr('cy',d=>d.y)
    .attr('cy',d=>y_scale(d.y))
    // .attr('r',3)
    .attr('r',(d,i)=>i+2)
    .attr('fill',(d,i)=>'#39b0e5' + i*15)
    
    svg.append('g')
        .attr('transform','translate(0,' +400 + ')')
    .call(xAxis)
    
    svg.append('g')
        .attr('transform','translate(20,0)')
       .call(yAxis)
​
  </script>
</body>
​
    