Psst: have a look at the JavaScript Console 💁

      // Get your shorts on - this is an array workout!
      // ## Array Cardio Day 1

      // Some data we can work with

      const inventors = [
        { first: 'Albert', last: 'Einstein', year: 1879, passed: 1955 },
        { first: 'Isaac', last: 'Newton', year: 1643, passed: 1727 },
        { first: 'Galileo', last: 'Galilei', year: 1564, passed: 1642 },
        { first: 'Marie', last: 'Curie', year: 1867, passed: 1934 },
        { first: 'Johannes', last: 'Kepler', year: 1571, passed: 1630 },
        { first: 'Nicolaus', last: 'Copernicus', year: 1473, passed: 1543 },
        { first: 'Max', last: 'Planck', year: 1858, passed: 1947 },
        { first: 'Katherine', last: 'Blodgett', year: 1898, passed: 1979 },
        { first: 'Ada', last: 'Lovelace', year: 1815, passed: 1852 },
        { first: 'Sarah E.', last: 'Goode', year: 1855, passed: 1905 },
        { first: 'Lise', last: 'Meitner', year: 1878, passed: 1968 },
        { first: 'Hanna', last: 'Hammarström', year: 1829, passed: 1909 }
      ];

      const people = ['Beck, Glenn', 'Becker, Carl', 'Beckett, Samuel', 'Beddoes, Mick', 'Beecher, Henry', 'Beethoven, Ludwig', 'Begin, Menachem', 'Belloc, Hilaire', 'Bellow, Saul', 'Benchley, Robert', 'Benenson, Peter', 'Ben-Gurion, David', 'Benjamin, Walter', 'Benn, Tony', 'Bennington, Chester', 'Benson, Leana', 'Bent, Silas', 'Bentsen, Lloyd', 'Berger, Ric', 'Bergman, Ingmar', 'Berio, Luciano', 'Berle, Milton', 'Berlin, Irving', 'Berne, Eric', 'Bernhard, Sandra', 'Berra, Yogi', 'Berry, Halle', 'Berry, Wendell', 'Bethea, Erin', 'Bevan, Aneurin', 'Bevel, Ken', 'Biden, Joseph', 'Bierce, Ambrose', 'Biko, Steve', 'Billings, Josh', 'Biondo, Frank', 'Birrell, Augustine', 'Black, Elk', 'Blair, Robert', 'Blair, Tony', 'Blake, William'];
    

      // Array.prototype.filter()
      // 1. Filter the list of inventors for those who were born in the 1500's

      const filteredList = inventors.filter( inventor => inventor.year >= 1500 && inventor.year <= 1599 );

      console.log('\n1. Filter the list of inventors for those who were born in the 1500\'s');
      console.table( filteredList );
  

      // Array.prototype.map()
      // 2. Give us an array of the inventors' first and last names

      const names = inventors.map( inventor => `${inventor.first} ${inventor.last}`);

      console.log('\n2. Give us an array of the inventors\' first and last names');
      console.log( names );
  

      // Array.prototype.sort()
      // 3. Sort the inventors by birthdate, oldest to youngest

      const yearSorted = inventors.sort( (a, b) => a.year > b.year ? 1 : -1 );

      console.log('\n3. Sort the inventors by birthdate, oldest to youngest')
      console.table( yearSorted );
  

      // Array.prototype.reduce()
      // 4. How many years did all the inventors live?

      const lifespan = (i) => i.passed - i.year;

      const years = inventors.reduce( (total, next) => {
          return total + lifespan( next );
      }, 0 );

      console.log('\n4. How many years did all the inventors live?');
      console.log( years + ' years');
  

      // 5. Sort the inventors by years lived

      const longevitySorted = inventors.sort( (a, b) => {
          return lifespan(a) > lifespan(b) ? 1 : -1;
      });

      console.log('\n5. Sort the inventors by years lived');
      console.table(longevitySorted);
  

      // 6. create a list of Boulevards in Paris that contain 'de' anywhere in the name
      // https://en.wikipedia.org/wiki/Category:Boulevards_in_Paris

      /* commented out in the actual script because the DOM
         is in another document*/

      const category = document.querySelector('.mw-category');
      const elems = category.querySelectorAll('a');

      const links = Array.from(elems);

      const de = links
                      .map( link => link.textContent )
                      .filter( link => link.indexOf('de') != -1 );

      console.log(de);

  

      // 7. sort Exercise
      // Sort the people alphabetically by last name

      const getLastName = (name) => name.slice(0, name.indexOf(', '));

      const nameSorted = people.sort( (a, b) => getLastName(a) > getLastName(b) ? 1 : -1);

      console.log('\n7. sort Exercise - Sort the people alphabetically by last name');
      console.log(nameSorted);
  

      // 8. Reduce Exercise
      // Sum up the instances of each of these
      const terms = ['car', 'car', 'truck', 'truck', 'bike', 'walk', 'car', 'van', 'bike', 'walk', 'car', 'van', 'car', 'truck', 'hoverboard' ];

      const countedTerms = terms.reduce( (obj, item) => {
          if (!obj[item]) obj[item] = 0;
          obj[item]++;
          return obj;
      }, {});

      console.log('\n8. Reduce Exercise - Sum up the instances of unknown terms');
      console.log(countedTerms);