How to load data from a CSV file in D3 v5

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d3 v5 uses the fetch API and returns a promise requiring the below code.

d3.csv('yourcsv.csv')
  .then(function(data) {
      // data is now whole data set
      // draw chart in here!
  })
  .catch(function(error){
     // handle error   
  })

In case in the future people want v4. d3 v4 on the other hand uses the XMLHttpRequest method, and does not return a promise requiring this code

d3.csv('yourcsv.csv', function(data) {
    //whole data set
    // draw chart here
})

csv loading is async so make sure to run your chart code within the csv function.

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