arrmethods

nitishdayal · nitishdayal · commit 12e8494f6897 · 2017-05-12T19:34:52.000-07:00
ARRR MATEY
diff --git a/exercises/04 - Array Cardio Day 1/index.html b/exercises/04 - Array Cardio Day 1/index.html
@@ -8,6 +8,7 @@
 
 <body>
   <script>
+  'use strict';
     // Get your shorts on - this is an array workout!
     // ## Array Cardio Day 1
 
@@ -29,65 +30,74 @@
 
     // Array.prototype.filter()
     // 1. Filter the list of inventors for those who were born in the 1500's
-    const inventors_from_1500s = inventors.filter(
-      (inventor) => inventor.year >= 1500 && inventor.year < 1600
-    )
+    const inventors_from_1500s = inventors.filter(({year}) => year >= 1500 && year < 1600);
 
-    console.table(inventors_from_1500s)
+    console.table(inventors_from_1500s);
 
     // Array.prototype.map()
     // 2. Give us an array of the inventors first and last names
-    const inventors_full_name = inventors.map((inventor) => `${inventor.first} ${inventor.last}`)
-    console.table(inventors_full_name)
+    const inventors_full_name = inventors.map(({first, last}) => first + ' ' + last);
+    console.log(inventors_full_name);
 
     // Array.prototype.sort()
     // 3. Sort the inventors by birthdate, oldest to youngest
-    const inventors_by_date = inventors.sort((a, b) => a.year - b.year)
-    console.table(inventors_by_date)
+    const inventors_by_date = inventors.sort(({year: a}, {year: b}) => a - b);
+    console.table(inventors_by_date);
 
     // Array.prototype.reduce()
     // 4. How many years did all the inventors live?
     const total_years_lived = inventors.reduce(
-      (currValue, inventor) => currValue += (inventor.passed - inventor.year), 0
-    )
+      (currValue, {passed, year}) => currValue += (passed - year), 0
+    );
     console.log(total_years_lived);
 
     // 5. Sort the inventors by years lived
     const inventors_by_lifespan = inventors.sort(
-      (a, b) => (a.passed - a.year) - (b.passed - b.year)
+      ({passed: aP, year: aY}, {passed: bP, year: bY}) => (aP - aY) - (bP - bY)
     );
     console.table(inventors_by_lifespan);
 
     // 6. create a list of Boulevards in Paris that contain 'de' anywhere in the name
     // https://en.wikipedia.org/wiki/Category:Boulevards_in_Paris
     /*
-    This code will be run directly from the browser console
-    after navigating to the Wikipedia link above.
-    
+    // This code will be run directly from the browser console
+    // after navigating to the Wikipedia link above.
+
     const blvd_with_de = Array.from(document.querySelectorAll('.mw-category a'))
-      .map(link => link.textContent)
+      .map(({textContent}) => textContent)
       .filter((blvd) => blvd.includes('de'))
-    */
 
+    */
     // 7. sort Exercise
     // Sort the people alphabetically by last name
-
     const people_by_last_name = people.sort((a, b) => a.split(', ')[0] < b.split(', ')[0] ? -1 : 1);
-
     console.log(people_by_last_name);
+
     // 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 data = [
+      'car',
+      'car',
+      'truck',
+      'truck',
+      'bike',
+      'walk',
+      'car',
+      'van',
+      'bike',
+      'walk',
+      'car',
+      'van',
+      'car',
+      'truck'];
 
     const data_instance_count = data.reduce((tallyObject, item) => {
-      if (!tallyObject[item]) {
-        tallyObject[item] = 0;
-      }
-      tallyObject[item]++;
-      return tallyObject;
+        tallyObject[item] ? tallyObject[item]++ : tallyObject[item] = 1;
+
+        return tallyObject;
     }, {});
+    console.dir(data_instance_count);
 
-    console.log(data_instance_count);
   </script>
 </body>
 
