D3 Examples - Sample problems 2: objects and arrays

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(s) {
      if (s.location == "East") {
        console.log(s.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")
   // var south = array1
   // if (south == "Arizona" && "Florida")
   // if (d.name)
   // if (name === "Arizona" && "Florida");
    // { state = "south"}; {
   // console.log (array1, function (d) {return d.name})}
    
        array1.forEach(function(s) {
      if (s.location.includes ("South")) {
        //string.includes(substring);
        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 (i){
      if (array3.includes(i) == false) {
      console.log(i)
      }
    })
 
    
  
  // Problem 4: 'states' is an array of objects. Sort the array in ascending order
  // by state name
  
  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(a,b) {
             return d3.ascending (a.name, b.name)
              })
  console.log(states);
            
  // Problem 5: write code that determines which state(s) have a population value that is an even number. Print out the state(s) to the console
states.forEach (function (s) {
                console.log(s.name, s.population, s.population % 2 == 0)
                })
  
  
​
  </script>
</body>
​
    