Day 100 of 180 Days of Data Viz Learning #jfdi

I’m doing some form of data visualization learning for 180 days because I need to #JFDI.

See post explaining how and why I’m doing this.

Code Learning:

Learn JS Reading Data 
Three Takeaways:

  • When loading CSVs and other flat files, you have to do the type conversion, or else numbers will come in as strings. A simple way to do this is to use the + operator (unary plus).
  • forEach can be used to iterate over the data array.
  • Dot notation is a useful way to access the properties of these data objects. However, if your headers have spaces in them, then you will need to use bracket notation as shown below.
  • d3.csv(“/data/cities.csv”, function(d) {
    return {
    city :,
    state : d.state,
    population : +d.population,
    land_area : +d[“land area”]
    }, function(data) {



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