Sample problems 2-27

<!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")

var array1 = [
    				{name: "Arizona",  location: "Southwest"},
           	{name: "Virginia", location: "East"},
            {name: "Florida",  location: "Southeast"}
           ];

array1.forEach(function(a) {
      if (a.location == "East") {
       console.log(a.name)
      }
    })
 console.log(".") 
 console.log(".")

// 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 array1 = [
    				{name: "Arizona",  location: "Southwest"},
           	{name: "Virginia", location: "East"},
            {name: "Florida",  location: "Southeast"}
           ];    
   
    
    
 array1.forEach(function(a) {
      if (a.location.includes("South")) 
       console.log(a.name)
     
    })  
console.log(".") 
console.log(".")
 
    
  // 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(c){
    if (array3.includes(c)){
        return false
        }
        console.log(c)
  })

/*array2.forEach(function(i){
   console.log(i)
  if (array3.includes(i) == false) {
    console.log(i)
  		}		
    })*/
  
  
  
  
  
 console.log(".") 
console.log(".") 
   
  // Problem 3: 'states' is an array of objects. Sort the array in ascending order
  // by state name, return 0 is a tie 
  console.log("Question 4") 
 var 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}] 
  
 console.log
 states.sort(function(a, b){
    if(a.name < b.name) return -1;
    if(a.name > b.name) return 1;
    return 0;
   
})
  
 console.log(states) 
//another way  
/* states.sort(function(a,b){
return d3.ascending(a.name, b.name)
})*/  
            
  // 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(i) {
    	if (i.population % 2 == 0){
       console.log(i.name) 
      }
  });

</script>
</body>

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