How to print in console from d3.js function?

@dana 

To print a value to the console from a d3.js function, you can simply use the console.log() method. For example:

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// Define a d3.js function
function myD3Function() {
  // Perform some calculations
  let result = 10 + 20;
  
  // Print the result to the console
  console.log("The result is: " + result);
}

// Call the d3.js function
myD3Function();

When you run this code, the result "The result is: 30" will be printed to the console. This is a common way to debug and log values when working with d3.js.