fresh block

<!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)

//     svg.append("text")
//       .text("Edit the code below to change me!")
//       .attr("y", 200)
//       .attr("x", 120)
//       .attr("font-size", 36)
//       .attr("font-family", "monospace")
let data = ['red', 'green', 'blue', 'yellow']
  
// let svg = d3.select("body").append("svg")

function update(data){  
  let things = svg.selectAll('rect').data(data)
  things = things.enter().append('rect').merge(things)

things.transition()
    .duration(600)
    .attr('width', 100).attr('height', 100)
    .attr('x', (d,i)=>i*110)
    .attr('fill', (d)=> d)

things.on('click', function(d,i){ 
    console.log(d,i)
    d3.select(this).raise().transition().attr('width', 300).attr('height', 300)
    console.log(this)
  })

things.on('dblclick', function(d,i){ 
		update(data)
  })
  
}
    
update(data)

</script>
</body>

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