challenge 4 is completed. Array methods.

Author: mrOrlando

04 - Array Cardio Day 1/index-START.html

@@ -32,28 +32,62 @@
 
     // Array.prototype.filter()
     // 1. Filter the list of inventors for those who were born in the 1500's
+    const fifteen = inventors.filter(inventor => (inventor.year >= 1500 && inventor.year < 1600));
+    console.table(fifteen);
 
     // Array.prototype.map()
     // 2. Give us an array of the inventors' first and last names
+    const fullNames = inventors.map(inventor => `${inventor.first} ${inventor.last}`);
+    console.log('fullNames', fullNames);
 
     // Array.prototype.sort()
     // 3. Sort the inventors by birthdate, oldest to youngest
+    const ordered = inventors.sort((a, b) => a.year > b.year ? 1 : -1);
+    console.table(ordered);
 
     // Array.prototype.reduce()
     // 4. How many years did all the inventors live?
+    const totalYears = inventors.reduce((total, inventor) => {
+      return total + (inventor.passed - inventor.year);
+    }, 0);
+    console.log('totalYears', totalYears);
 
     // 5. Sort the inventors by years lived
+    const oldest = inventors.sort(function(a, b) {
+        const lastGuy = a.passed - a.year;
+        const nextGuy = b.passed - b.year;
+        return lastGuy > nextGuy ? -1 : 1;
+    });
+    console.table(oldest);
 
     // 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 category = document.querySelector('.mw-category');
+    const links = Array.from(category.querySelectorAll('a'));
+    const de = links
+                .map(link => link.textContent)
+                .filter(streetName => streetName.includes('de'));*/
 
     // 7. sort Exercise
     // Sort the people alphabetically by last name
+    const alpha = people.sort((a, b) => {
+        const [aLast, aFirst] = a.split(', ');
+        const [bLast, bFirst] = b.split(', ');
+        return aLast > bLast ? 1 : -1;
+    });
+    console.log('alpha', alpha);
 
     // 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 transportation = data.reduce((obj, item) => {
+        if (!obj[item]) {
+            obj[item] = 0;
+        }
+        obj[item]++;
+        return obj;
+    }, {});
+    console.log('transportation', transportation);
 
   </script>
 </body>