@@ -33,29 +33,42 @@
 
     // Array.prototype.filter()
     // 1. Filter the list of inventors for those who were born in the 1500's
+    const bornInFifteenHundreds = inventors.filter( inventor => inventor.year >= 1500 && inventor.year < 1600)
 
     // Array.prototype.map()
     // 2. Give us an array of the inventors' first and last names
+    const firstLastNames = inventors.map( inventor => ({first: inventor.first, last: inventor.last}))
 
     // Array.prototype.sort()
     // 3. Sort the inventors by birthdate, oldest to youngest
+    inventors.sort( (a, b) => a.year - b.year)
 
     // Array.prototype.reduce()
     // 4. How many years did all the inventors live?
+    const totalYears = inventors.reduce( (total, inventor) => inventor.passed - inventor.year + total, 0)
 
     // 5. Sort the inventors by years lived
+    inventors.sort( (a, b) => (a.passed - a.year) - (b.passed - b.year) )
 
     // 6. create a list of Boulevards in Paris that contain 'de' anywhere in the name
     // https://en.wikipedia.org/wiki/Category:Boulevards_in_Paris
+    const blvdsDOM = document.querySelectorAll('.mw-category-group li')
+    const blvds = Array.from(blvdsDOM).map(b => b.innerText)
+    const blvdsDE = blvds.filter(b => b.toLowerCase().includes('de'))
 
 
     // 7. sort Exercise
     // Sort the people alphabetically by last name
+    people.sort()
 
     // 8. Reduce Exercise
     // Sum up the instances of each of these
     const data = ['car', 'car', 'truck', 'truck', 'bike', 'walk', 'car', 'van', 'bike', 'walk', 'car', 'van', 'car', 'truck' ];
-
+    const instances = data.reduce( (prev, curr) => {
+      if (!prev[curr]) prev[curr] = 1
+      else prev[curr] += 1
+      return prev
+    }, {})
   </script>
 </body>
 </html>