Sample problems 3

forked from jorgencm's block: Sample problems 2

forked from jorgencm's block: Sample problems 3

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>

<body>
  <h1>Please look in the code below for 4 JavaScript practice problems.</h1>
  <p>(These problems don't include any SVG manipulation, so you will need to open the developer console in order to see the output of your code)</p>
  <script>

states = [{name: "Alaska", id: "AK", population: 741894},
            {name: "Virginia", id: "VA", population: 8411808},
    				{name: "Arizona", id: "AZ", population: 6931071},
            {name: "Florida", id: "FL", population: 20984400}]
            
  // Problem 1: using d3.mean(), compute and print the average (mean) 
  // population of the states in the states array
 
  var population_mean
  d3.mean(states, function(i) { return i.population_mean; });
console.log(population_mean);

// Problem 2: WITHOUT using d3.mean(), compute and print the average (mean) 
  // population of the states in the states array
    
    var populationExtent
    d3.extent(states, function(i) { return i.population_mean; });
console.log(populationExtent);

</script>
</body>

https://d3js.org/d3.v4.min.js