How does d3.csv function type works?

@darrion.kuhn 

d3.csv function is used in D3.js library to load data from a CSV file. The function takes a URL to a CSV file as input and returns a Promise. Once the Promise is resolved, the data from the CSV file is returned as an array of objects, where each object represents a row from the CSV file with keys as column names and values as the data in each cell.

The function type allows you to specify additional parsing options when loading the data, such as specifying a custom parsing function for each row or column, handling missing values, and formatting the data as needed.

Here is an example of how d3.csv function can be used:

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d3.csv("data.csv")
  .then(function(data) {
    console.log(data); // Array of objects representing rows from the CSV file
  })
  .catch(function(error) {
    console.log(error);
  });

In the above example, the d3.csv function is used to load data from a CSV file called "data.csv". Once the Promise is resolved, the data is logged to the console as an array of objects. If an error occurs during loading the CSV file, the catch function will log the error to the console.