D3 Examples - In-class Practice Problems

xxxxxxxxxx
 
<!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>
  // Problem 1: search array1 for those states whose location is "East"
  // using console.log(), print just the state name(s).
console.log("Question 1")
  array1 = [
                    {name: "Arizona",  location: "Southwest"},
            {name: "Virginia", location: "East"},
            {name: "Florida",  location: "Southeast"}
           ];
array1.forEach (function (d) {
  if(d.location == "East"){
    console.log(d.name)
  }
})
       
  // Problem 2: search array1 (above) for those states whose location contains the substring "South"
  // using console.log(), print just the state name(s) for these states.
console.log("Question 2")
array1.forEach (function (s){
  if (s.location.includes("South")){
    console.log(s.name)
  }
})
   
  // Problem 3: using iteration and console.log(), print those items that are in
  // array2 but NOT in array3
  console.log("Question 3")  
  array2 = ['a','b','c', 65, 'd'];
  array3 = ['a','c','e','f','g', 87];
    
  array2.forEach(function (d){
    if (array3.includes(d) == false){
      console.log(d)
    }
  })
 
  // Problem 3: 'states' is an array of objects. Sort the array in ascending order
  // by state name
  console.log("Question 4")
  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}]
  
  states.sort(function (x,y){
    return d3.ascending (x.name, y.name)
  })
 console.log(states)           
  // Problem 4: write code that determines which state(s) have a population value that is an even number. Print out the state(s) to the console
console.log("Question 5")
states.forEach(function (d){
  if (d.population % 2 == 0){
    console.log(d)
  } 
})    
​
  </script>
</body>
    