Old school D3 from simpler times

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lambrex

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circles

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>

</head>
<script>
var spaceCircles = [30, 70, 110];
 
 var svgContainer = d3.select("body").append("svg")
                                    .attr("width", 200)
                                    .attr("height", 200);
 
 var circles = svgContainer.selectAll("circle")
                           .data(spaceCircles)
                           .enter()
                          .append("circle");

var circleAttributes = circles
                       .attr("cx", function (d) { return d; })
                       .attr("cy", function (d) { return d; })
                       .attr("r", 20 )
                       .style("fill", function(d) {
                         var returnColor;
                         if (d === 30) { returnColor = "green";
                         } else if (d === 70) { returnColor = "purple";
                         } else if (d === 110) { returnColor = "red"; }
                         return returnColor;
                       });
</script>

https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js