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arrays.js
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arrays.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
let filtered = inventors.filter(inventor => inventor.year >= 1500)
// Array.prototype.map()
// 2. Give us an array of the inventors' first and last names
let mappedInventors = inventors.map(inventor => `${inventor.first} ${inventor.last}`)
// Array.prototype.sort()
// 3. Sort the inventors by birthdate, oldest to youngest
let sortedInventors = inventors.sort((a, b) => a.year > b.year ? 1 : -1)
// Array.prototype.reduce()
// 4. How many years did all the inventors live?
const totalYears = inventors.reduce((total, inventor) => {
return total + (inventor.passed - inventor.year); // acc + current value
}, 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;
return lastInventor > nextInventor ? -1 : 1;
});
// 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
let lastNameSort = inventors.sort(function (a, b){
return a.last > b.last ? 1 : -1
})
// 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' ];
const count = data.reduce((obj, transport) => {
if (!obj[transport]){
obj[transport] = 0
}
obj[transport] += 1
return obj
}, {});
//*******************************************************************************************
// ## Array Cardio Day 2
const people2 = [
{ name: 'Wes', year: 1988 },
{ name: 'Kait', year: 1986 },
{ name: 'Irv', year: 1970 },
{ name: 'Lux', year: 2015 }
];
const comments = [
{ text: 'Love this!', id: 523423 },
{ text: 'Super good', id: 823423 },
{ text: 'You are the best', id: 2039842 },
{ text: 'Ramen is my fav food ever', id: 123523 },
{ text: 'Nice Nice Nice!', id: 542328 }
];
// Some and Every Checks
// Array.prototype.some() // is at least one person 19 or older?
// Array.prototype.every() // is everyone 19 or older?
var today = new Date();
var year = today.getFullYear();
const isEverybody19 = people2.every((element) => year - element.year >= 19)
const isAnyone19 = people2.some((element) => year - element.year >= 19)
// Array.prototype.find()
// Find is like filter, but instead returns just the one you are looking for
// find the comment with the ID of 823423
const findId = comments.find(comment => comment.id === 823423);
// Array.prototype.findIndex()
// Find the comment with this ID
// delete the comment with the ID of 823423
const findIdIndex = comments.findIndex(element => element.id === 823423)
comments.splice(findIdIndex, 1)