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<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
mean = d3.mean(states,function(c) {
return c.population
});
console.log(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 numberofStates = 0;
states.forEach(function(d){
population += d.population
})
var mean = population / states.length;
console.log (mean)
// another way in doing this is to do a while loop
var population5 = 0;
var mean5 = 0;
var i = 0;
while(i < states.length) { //describes the length of the array
population5 = population5 + states[i].population // or +=
i++;
}
mean = population / states.length;
console.log("mean:",mean)
</script>
</body>
https://d3js.org/d3.v4.min.js