Fill patterns

<!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 svg = d3.select("body").append("svg")
      .attr("width", 960)
      .attr("height", 500)
    
    data=d3.range(12)
    
    
    svg.selectAll('pattern')
      .data(data)
      .enter()
      .append('pattern')
    	.attr("id",function(d){return "hatch"+d})
    	.attr("patternUnits","userSpaceOnUse")
    	.attr("patternTransform",function(d){return "rotate("+(d*15)+ " 0 0)"})
    	.attr("width",4)
    	.attr("height",4)
    	.append("line")
    	.attr("x1",0)
    	.attr("y1",0)
    	.attr("x2",0)
    	.attr("y2",2)
    	.style("stroke","black")
    	.style("stroke-width",1)
    
    svg.selectAll('rect')
    	.data(data)
    	.enter()
    	.append('rect')
      .attr("y", 70)
      .attr("x", function(d){return d*70+20})
    	.attr("width",50)
    	.attr("height",50)
    	.attr("fill",function(d){return "url(#hatch"+d+")"})
    	.attr("stroke","black")
    	.attr("stroke-width","1")

</script>
</body>

https://d3js.org/d3.v4.min.js