Sample Problems 3 Completed

forked from jorgencm's block: Sample Problems 3 Completed

<!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;
  });
  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 population = 0;
  var mean = 0;
  var i = 0;
    
  while ( true ) {
    // don't freeze
    population = population + states[i].population;
    population += states[i].population;
    i++;
  }
  
  mean = population / states.length;
  console.log("mean:", mean)

</script>
</body>

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