How to load json data synchronously with d3.js?

@adan 

In d3.js, you can load JSON data synchronously using the d3.json function. By default, d3.json loads data asynchronously, but you can modify it to load data synchronously by using d3.json().await. Here's an example of how you can achieve synchronous loading of JSON data with d3.js:

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// Define the JSON file path
var jsonFile = "path/to/your/data.json";

// Use d3.json() to load the data synchronously
var json = d3.json(jsonFile).await(function(error, data) {
  if (error) throw error;

  // Process the loaded data
  console.log(data);
});

In the above code, d3.json(jsonFile) loads the data asynchronously, and await is used to make it synchronous. The loaded data is then processed within the callback function. If an error occurs during loading, it is thrown using throw error.

Note that using synchronous loading blocks the further execution of code until the data is fully loaded, so it's generally recommended to use asynchronous loading whenever possible to maintain better performance and responsiveness.