javascript30/array-cardio-1/index.html at master · skullface/javascript30 · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Array Cardio 💪</title>
</head>
<body>
  <p><em>Psst: have a look at the JavaScript Console</em> 💁</p>

<script>
  const inventors = [
    { first: 'Albert', last: 'Einstein', born: 1879, died: 1955 },
    { first: 'Isaac', last: 'Newton', born: 1643, died: 1727 },
    { first: 'Galileo', last: 'Galilei', born: 1564, died: 1642 },
    { first: 'Marie', last: 'Curie', born: 1867, died: 1934 },
    { first: 'Johannes', last: 'Kepler', born: 1571, died: 1630 },
    { first: 'Nicolaus', last: 'Copernicus', born: 1473, died: 1543 },
    { first: 'Max', last: 'Planck', born: 1858, died: 1947 },
    { first: 'Katherine', last: 'Blodgett', born: 1898, died: 1979 },
    { first: 'Ada', last: 'Lovelace', born: 1815, died: 1852 },
    { first: 'Sarah E.', last: 'Goode', born: 1855, died: 1905 },
    { first: 'Lise', last: 'Meitner', born: 1878, died: 1968 },
    { first: 'Hanna', last: 'Hammarström', born: 1829, died: 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()
   * ===========================================
   * Filter the list of inventors for those who were born in the 1500's
   */

  /*
   * long version:
   *
    const fifteen = inventors.filter(function(inventor){
    if(inventor.born >= 1500 && inventor.born <= 1599) {
      return true;
    }
    });
   *
   */

  const sixteenthCentury = inventors.filter(inventor => (inventor.born >= 1500 && inventor.born <= 1599));

  console.table(sixteenthCentury);


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

  const fullNames = inventors.map(function(inventor) {
    return `${inventor.first} ${inventor.last}`;
  }); //I WROTE THAT ONE BY MYSELF BITCH

  console.log(fullNames);


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

 /*
  * long version:
  *
  const birthdayParty = inventors.sort(function(x, y) {
    if(x.born > y.born) {
      return 1;
    } else {
      return -1;
    }
  });
  *
  */

  const birthdayParty = inventors.sort((x, y) => x.born > y.born ? 1 : -1);

  console.table(birthdayParty);


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

  const totalLifespan = inventors.reduce((total, inventor) => {
    return total + (inventor.died - inventor.born);
  }, 0);

  console.log(totalLifespan);


  /*
   * ===========================================
   * Sort the inventors by years lived
   */

  const seniority = inventors.sort(function(x, y) {
    const seniorityOldest = x.died - x.born;
    const seniorityNext = y.died - y.born;
    return seniorityOldest > seniorityNext ? -1 : 1;
/*  if seniorityOldest > seniorityNext {
      return -1;
    }
    else {
      return 1;
    }
*/ //long version of the ternary operator `? : above`
  });

  console.table(seniority);


  /*
   * 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 = category.querySelectorAll('a'));
   * doesn't work for our purposes because that gives us the data in a nodeMap thingy, not an array. so let's make it an array!

  const links = Array.from(category.querySelectorAll('a'));

   * alsooOo we could just do `.mw-category a` in the first variable, but this proves we can "querySelect" more than one thing. cool! another way to write that Array line is
   * const links = [...category.querySelectorAll('a')];
   * using ES6 spreads… ok!!

  const de = links
    .map(link => link.textContent)
    .filter(streetName => streetName.includes('de'));
    // ^ putting each of those on their own line lets us do the mapping and the filtering right after each other in the same variable
  */

  /*
   * sort Exercise
   * ===========================================
   * Sort the people alphabetically by last name
   */

  const alphabetically = people.sort((lastPerson, nextPerson) => {
    const [aLastName, aFirstName] = lastPerson.split(', '); // what do these brackets do????
    const [bLastName, bFirstName] = lastPerson.split(', ');
    return aLastName > bLastName ? 1 : -1; // i get these idea of this from our sorting, but i do not understand the above thingies with the split because those aren't even in our output?
  });
  console.log(alphabetically);

  /*
   * 8. Reduce Exercise
   * ===========================================
   * Sum up the instances of each of these
   */

  const vehicles = ['car', 'car', 'truck', 'truck', 'bike', 'walk', 'car', 'van', 'bike', 'walk', 'car', 'van', 'car', 'truck' ];

  const transportation = vehicles.reduce(function(obj, item){
    if(!obj[item]) {
      obj[item] = 0;
    }
    obj[item]++;
    return obj;
  }, {});

  // what the fuck was that

  console.log(transportation);

</script>
</body>
</html>