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HTML

              
                <p><em>Array Metoda</em> 💁</p>
              
            
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CSS

              
                
              
            
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JS

              
                <script>
    // 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() - FUNKCJA FILTRUJĄCA. Zwraca true or false i na tej podstawie tworzy nową tablicę.     
    // 1. Filter the list of inventors for those who were born in the 1500's
    const fifteen = inventors.filter(function(inventor) {
     if(inventor.year >= 1500 && inventor.year < 1600) { //jeśli inventor rok jest >= 1500 i inventor rok jest <1600
      return true; //to zwróć prawdę, czyli keep it
    }
  });
    //console.table(fifteen); - wyswietla w tablicach

    //inny zapis tej samej funkcji const fifteen = inventors.filter(inventor => (inventor.year >= 1500 && inventor.year < 1600)); 

   

    // Array.prototype.map() - FUNKCJA DO WYWOŁYWANIA POSZCZEGÓŁNYCH ELEMENTÓW
    // 2. Give us an array of the inventors' first and last names
    const fullNames = inventors.map(inventor => inventor.first + inventor.last);

    //jeśli bym chciała spację między imie a nazwisko zapis powinien byc const fullNames = inventors.map(inventor => `${inventor.first} ${inventor.last}`);
    

    

    // Array.prototype.sort() - FUNKCJA SORTUJE WG JAKIEJS ZMIENNEJ
    // 3. Sort the inventors by birthdate, oldest to youngest
    const ordered = inventors.sort(function(firstPerson, secondPerson) {
      if(firstPerson.year > secondPerson.year) {
        return 1;
      } else {
        return -1;
      }
    });
    console.table(ordered);

    //to samo zapisane w 1 linijce const ordered = inventors.sort((a, b) => a.year > b.year ? 1 : -1);




    // Array.prototype.reduce() - FUNKCJA, KTÓRA SŁUŻY DO SPROWADZENIA TABLICY DO POJEDYNCZEJ WARTOŚCI, NP. POLICZ WSZYSTKIE ZNAKI.
    // 4. How many years did all the inventors live?
      const totalYears = inventors.reduce((total, inventor) => {
      return total + (inventor.passed - inventor.year);
    }, 0);



    // 5. Sort the inventors by years lived
      const oldest = inventors.sort(function(a, b) {
        const lastInventor = a.passed - a.year;
        const nextInventor = b.passed - b.year;
        if(lastInventor > nextInventor) { //to samo (od if do return 1) możemy zapisać dużo krócej: return lastInventor > nextInventor ? -1 : 1;
          return -1;
        }  else {
          return 1;
        }
      });
      console.log(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((lastOne, nextOne) => {
      const [aLast, aFirst] = lastOne.split(', ');
      const [bLast, bFirst] = nextOne.split(', ');
      return aLast > bLast ? 1 : -1;
    });
    console.log(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', 'pogostick'];
    const transportation = data.reduce(function(obj, item) {
      if (!obj[item]) {
        obj[item] = 0;
      }
      obj[item]++;
      return obj;
    }, {});
    console.log(transportation);
              
            
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