main.js
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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 fifteen = inventors.filter(inventor => inventor.year > 1499 && inventor.year < 1600
)
console.log(fifteen)

// 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(names)

// Array.prototype.sort()
// 3. Sort the inventors by birthdate, oldest to youngest
const sorted = inventors.sort((first, next) => first.year > next.year ? 1 : -1)
console.log(sorted)
// Array.prototype.reduce()
// 4. How many years did all the inventors live?

const totalYears = inventors.reduce((total, inventor) => total + (inventor.passed - inventor.year), 0)
console.log(totalYears)

// 5. Sort the inventors by years lived

inventors.forEach(inventor => inventor.age = inventor.passed - inventor.year)
const sortedAge = inventors.sort((first, next) => first.age > next.age ? 1 : -1)
console.log(inventors)

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


// 7. sort Exercise
// Sort the people alphabetically by last name
const sortedPeople = people.sort()
console.log(sortedPeople)

// 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 totalYears = inventors.reduce((total, inventor) => total + (inventor.passed - inventor.year), 0)
// console.log(totalYears)

const newData = data.reduce((object, item) => {
  if (!object[item]) {
    object[item] = 0;
  }
  object[item]++;
  return object
}, {})
console.log(newData)
Native Browser JavaScript