window.addEventListener('keydown', function(e) {
const audio = document.querySelector(`audio[data-key="${e.keyCode}"]`);
const key = document.querySelector(`.key[data-key="${e.keyCode}"]`)
if(audio) return;
audio.currentTime = 0;
audio.play();
key.classList.add('playing')
});
function removeTransition(e) {
if(e.propertyName !== 'transform') return;
this.classList.remove('playing');
}
const keys = document.querySelectorAll('.key');
keys.forEach(key => key.addEventListener('transitionend', removeTransition));// 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
const fifteen = inventors.filter(inventor => (inventor.year >= 1500 && inventor.year < 1600));
console.table(fifteen);
// Array.prototype.map()
// 2. Give us an array of the inventors' first and last names
const fullNames = inventors.map(inventor => `${inventor.first} ${inventor.last}`)
console.log(fullNames)
// Array.prototype.sort()
// 3. Sort the inventors by birthdate, oldest to youngest
const ordered = inventors.sort((a,b) => a.year > b.year ? 1 : -1)
console.table(ordered)
// Array.prototype.reduce()
// 4. How many years did all the inventors live?
const totalYears = inventors.reduce((total, inventor) => {
return total + (inventor.passed - inventor.year);
}, 0);
console.log(totalYears)
// 5. Sort the inventors by years lived
const oldest = inventors.sort(function(a, b) {
const lastGuy = a.passed - a.year;
const nextGuy = b.passed - b.year;
return lastGuy > nextGuy ? -1 : 1;
});
console.table(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' ];
const transportation = data.reduce(function(obj, item) {
if(!obj[item]) {
obj[item] = 0;
}
obj[item]++;
return obj;
}, {});
console.log(transportation)// ## Array Cardio Day 2
const people = [
{ 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?
const isAdult = people.some(person => ((new Date())
.getFullYear()) - person.year >= 19);
console.log({isAdult});
// Array.prototype.every() // is everyone 19 or older?
const allAdults = people.every(person => ((new Date())
.getFullYear()) - person.year >= 19);
console.log({allAdults});
// 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 comment = comments.find(comment => comment.id === 823423);
console.log(comment);
// Array.prototype.findIndex()
// Find the comment with this ID
const index = comments.findIndex(comment => comment.id === 823423);
console.log(index);
// delete the comment with the ID of 823423
const newComments = [
...comments.slice(0, index),
...comments.slice(index + 1)
];
console.table(newComments)// start with strings, numbers and booleans
// let age = 100;
// let age2 = age;
// console.log(age, age2);
// age = 200;
// console.log(age, age2);
//
// let name = 'Evan';
// let name2 = name;
// console.log(name, name2);
// name = 'evan';
// console.log(name, name2);
// Let's say we have an array
const players = ['Wes', 'Sarah', 'Ryan', 'Poppy'];
// and we want to make a copy of it.
const team = players;
// You might think we can just do something like this:
// team[3] = 'Lux';
// however what happens when we update that array?
// now here is the problem!
// oh no - we have edited the original array too!
// Why? It's because that is an array reference, not an array copy. They both point to the same array!
// So, how do we fix this? We take a copy instead!
const team2 = players.slice();
// one way
// or create a new array and concat the old one in
const team3 = [].concat(players);
// or use the new ES6 Spread
const team4 = [...players];
team4[3] = 'haww';
console.log(team4);
const team5 = Array.from(players)
// now when we update it, the original one isn't changed
// The same thing goes for objects, let's say we have a person object
// with Objects
const person = {
name: 'Wes Bos',
age: 80
};
// and think we make a copy:
const captain = person;
captain.number = 99;
// how do we take a copy instead?
const cap2 = Object.assign({}, person, { number: 99, age: 12 });
console.log(cap2);
// We will hopefully soon see the object ...spread
const cap3 = {...person};
// Things to note - this is only 1 level deep - both for Arrays and Objects. lodash has a cloneDeep method, but you should think twice before using it.
const wes = {
name: 'wes',
age: 100,
social: {
twitter: '@twitter',
facebook: 'facebook.name'
}
};
console.clear();
console.log(wes);
const dev = Object.assign({}, wes);
const dev2 = JSON.parse(JSON.stringify(wes));const timeNodes = Array.from(document.querySelectorAll('[data-time]'));
const seconds = timeNodes
.map(node => node.dataset.time)
.map(timeCode => {
const [mins, secs] = timeCode.split(':').map(parseFloat);
return (mins * 60) + secs;
})
.reduce((total, vidSeconds) => total + vidSeconds);
let secondsLeft = seconds;
const hours = Math.floor(secondsLeft / 3600);
secondsLeft = secondsLeft % 3600;
const mins = Math.floor(secondsLeft / 60);
secondsLeft = secondsLeft % 60;
console.log(hours, mins, secondsLeft);