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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>
// 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
/* 解法 */
// const bornArr = inventors.filter(function(inventor){
// if (inventor.year >= 1500 && inventor.year < 1600){
// return true;
// }
// })
/* 簡化語法 */
const bornArr = inventors.filter( inventor => inventor.year >= 1500 && inventor.year < 1600)
console.table(bornArr);
// Array.prototype.map()
// 2. Give us an array of the inventors' first and last names
/* 解法 */
// const newInventors = inventors.map(function(inventor){
// return inventor.first + ' ' + inventor.last
// })
/* 簡化語法 */
// const newInventors = inventors.map( inventor => inventor.first + ' ' + inventor.last);
const newInventors = inventors.map( inventor => `${inventor.first} ${inventor.last}`); //Template String
console.log(newInventors);
// Array.prototype.sort()
// 3. Sort the inventors by birthdate, oldest to youngest
/* 解法 */
// const sortInventors = inventors.sort(function(a, b){
// if ( a.year > b.year){
// return 1
// }else{
// return -1
// }
// })
/* 簡化語法 */
const sortInventors = inventors.sort( (a, b) => a.year > b.year ? 1 : -1 )
console.table(sortInventors)
// Array.prototype.reduce()
// 4. How many years did all the inventors live?
/* 解法 */
// const totalYears = inventors.reduce(function(total, inventor){
// return total + (inventor.passed - inventor.year)
// }, 0)
/* 簡化語法 */
const totalYears = inventors.reduce( (total, inventor) => total + (inventor.passed - inventor.year) , 0)
console.log(totalYears);
// 5. Sort the inventors by years lived
/* 解法 */
// const sortYearsLived = inventors.sort(function(a, b){
// const aYearCount = a.passed - a.year;
// const bYearCount = b.passed - b.year;
// if ( aYearCount > bYearCount) {
// return -1
// }else{
// return 1
// }
// })
/* 簡化語法 */
const sortYearsLived = inventors.sort( (a, b) => {
const aYearCount = a.passed - a.year;
const bYearCount = b.passed - b.year;
return aYearCount > bYearCount ? -1 : 1
})
console.table(sortYearsLived);
// 6. create a list of Boulevards in Paris that contain 'de' anywhere in the name
// https://en.wikipedia.org/wiki/Category:Boulevards_in_Paris
/* 解法 */
// const category = document.querySelector('.mw-category');
// const Links = [...category.querySelectorAll('a')];
// const de = Links
// .map( link => link.textContent)
// .filter( tName => tName.includes('de'))
// console.log(de);
// 7. sort Exercise
// Sort the people alphabetically by last name
/* 解法 */
// const sortPeople = people.sort(function(a, b){
// const [aLast, aFirst] = a.split(', '); //解構賦值(Destructuring Assignment)
// const [bLast, bFirst] = b.split(', '); //解構賦值(Destructuring Assignment)
// if(aLast > bLast){
// return 1
// }else{
// return -1
// }
// })
/* 簡化語法 */
const sortPeople = people.sort( (a, b) => {
const [aLast, aFirst] = a.split(', '); //解構賦值(Destructuring Assignment)
const [bLast, bFirst] = b.split(', '); //解構賦值(Destructuring Assignment)
return aLast > bLast ? 1 : -1
})
console.log(sortPeople);
// 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' ];
/* 解法 */
// const dataCount = data.reduce(function(counts, item){
// if(!counts[item]){
// counts[item] = 0;
// }
// counts[item] += 1;
// return counts;
// }, {})
/* 簡化語法 */
const dataCount = data.reduce( (counts, item) => {
if(!counts[item]){
counts[item] = 0;
}
counts[item] += 1;
return counts;
}, {})
console.log(dataCount)
</script>
</body>
</html>