Day 2: Array Cardio 1

April 13th, 2018

This time my job was easier. I had worked a lot with arrays in FreeCodeCamp, so I was in familiar territory. Additionally, I wanted to try a new tactic to see if it would be better: I watched a bit of the video to get the right constant names and whatnot, but paused before he started the actual task, and tried to do it solo first.

At first, I was a little rusty. I got stuck on the first couple and watched how he did them. This caught me up a little bit though because by the 4th task, I was writing my own lines!

Javascript code of array practice

There were definitely some corrections that needed to be made though:

This was the correct and final version of part 7:

Javascript coding of part 7

This was my initial try of part 7:

Javascript incorrect coding of part 7

Although, that really was my very first attempt that was changed immediately, but I needed some hints for that task.

There was a lot of stuff that I just used a simple if statement for that Wes brings out all these Javascript “tricks” that fly right over my head. This version of part 7 for instance:

Wes's JavaScript 30 day 2 part 7 coding

Overall, this was a much more successful day albeit I have a lot of syntax I have to look up about it.

Here’s my final code:

<!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
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 names = inventors.map(inventor => inventor.first + ” + inventor.last);

console.log(names);
// Array.prototype.sort()
// 3. Sort the inventors by birthdate, oldest to youngest
const ordered = inventors.sort(function(a, b) {
if (a.year >b.year) {
return 1;
} else {
return -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) {
if ((a.passed – a.year) > (b.passed – b.year)) {
return -1;
} else {
return 1;
}
});

console.log(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’));

console.log(de);
// 7. sort Exercise
// Sort the people alphabetically by last name
const alpha = people.sort(function(lastOne, nextOne) {
const [aLast, aFirst] = lastOne.split(‘, ‘);
const [bLast, bFirst] = nextOne.split(‘, ‘);
if aLast > bLast {
return -1;
} else {
return 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);
</script>
</body>
</html>

Here’s the link, but there is nothing there, since this activity existed solely in the console.