How to write if statement in d3.js?

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// Example data
var data = [5, 10, 15, 20];

// Select the SVG container
var svg = d3.select("svg");

// Bind the data to circles
var circles = svg.selectAll("circle")
  .data(data)
  .enter()
  .append("circle")
  .attr("cx", function(d, i) {
    // Use an if statement to set the x-coordinate based on the data
    if (d < 10) {
      return i * 30 + 20;  // If the data is less than 10, set x-coordinate using i
    } else {
      return i * 30 + 50;  // If the data is greater than or equal to 10, set x-coordinate using i + 30
    }
  })
  .attr("cy", 50)
  .attr("r", 10);