JS 30
by Angelina
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'];
var newArray = arr.filter(callback)
const fifteen = inventors.filter(function(inventor) {
if(inventor.year >= 1500 && inventor.year <= 1599) {
return true
}
})
console.log(fifteen)
console.table(fifteen)
const fifteen = inventors.filter(inventor => inventor.year >= 1500 && inventor.year <= 1599)
let new_array = arr.map(callback)
const fullNames = inventors.map(inventor => inventor.first+ '' + inventor.last)
const fullNames = inventors.map(inventor => `${inventor.first} ${inventor.last}`);
console.log(fullNames);
arr.sort([compareFunction])
const ordered = inventors.sort(function(a, b) {
if(a.year > b.year) {
return 1;
} else {
return -1;
}
});
const ordered = inventors.sort((a, b) => a.year > b.year ? 1 : -1);
console.table(ordered);
let totalYears = 0
for(let i = 0; i < inventors.length; i++) {
totalYears += (inventors[i].passed - inventors[i].year)
}
console.log(totalYear)
arr.reduce(callback, initialValue)
const totalYears = inventors.reduce((total, inventor) => {
return total + (inventor.passed - inventor.year);
}, 0);
console.log(totalYears);
( A ) filter
( B ) sort
( A ) reduce
( B ) map
( A ) reduce
( B ) map
( C ) filter
( D ) sort
( E ) 以上皆非
( F ) 以上皆是
(未處理相等情況)
const oldest = inventors.sort((a, b) => {
const lastGuy = a.passed - a.year;
const nextGuy = b.passed - b.year;
return lastGuy > nextGuy ? -1 : 1 ;
})
console.table(oldest)
https://en.wikipedia.org/wiki/Category:Boulevards_in_Paris
const category = document.querySelector('.mw-category');
const category = document.querySelector('.mw-category');
const links = category.querySelectorAll('a');
const category = document.querySelector('.mw-category');
const links = category.querySelectorAll('a');
const de = links.map(link => link.textContent);
const category = document.querySelector('.mw-category');
const links = Array.from(category.querySelectorAll('a'));
//const links = [...category.querySelectorAll('a')]
const de = links.map(link => link.textContent)
( A ) file
( B ) filled
( C ) filter
( D ) full
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'));
const alpha = people.sort((lastOne, nextOne) => {
console.log(lastOne, nextOne)
});
const alpha = people.sort((lastOne, nextOne) => {
const parts = lastOne.split(', ')
console.log(parts)
});
const alpha = people.sort((lastOne, nextOne) => {
const [last, first] = lastOne.split(', ');
console.log(last, first)
});
const alpha = people.sort((lastOne, nextOne) => {
const [aLast, aFirst] = lastOne.split(', ');
const [bLast, bFirst] = nextOne.split(', ');
return aLast > bLast ? 1 : -1;
});
console.log(alpha);
const data = ['car', 'car', 'truck', 'truck', 'bike', 'walk', 'car', 'van', 'bike', 'walk', 'car', 'van', 'car', 'truck', 'pogostick'];
const transportation = data.reduce((obj, item) => {
if (!obj[item]) {
obj[item] = 0;
}
obj[item]++;
return obj;
}, {});
console.log(transportation)