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Commit ceda6e0c authored by Andrej Rasevic's avatar Andrej Rasevic
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updating week4 material

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// This optional code is used to register a service worker.
// register() is not called by default.
// This lets the app load faster on subsequent visits in production, and gives
// it offline capabilities. However, it also means that developers (and users)
// will only see deployed updates on subsequent visits to a page, after all the
// existing tabs open on the page have been closed, since previously cached
// resources are updated in the background.
// To learn more about the benefits of this model and instructions on how to
// opt-in, read https://bit.ly/CRA-PWA
const isLocalhost = Boolean(
window.location.hostname === 'localhost' ||
// [::1] is the IPv6 localhost address.
window.location.hostname === '[::1]' ||
// 127.0.0.0/8 are considered localhost for IPv4.
window.location.hostname.match(
/^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
)
);
export function register(config) {
if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
// The URL constructor is available in all browsers that support SW.
const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href);
if (publicUrl.origin !== window.location.origin) {
// Our service worker won't work if PUBLIC_URL is on a different origin
// from what our page is served on. This might happen if a CDN is used to
// serve assets; see https://github.com/facebook/create-react-app/issues/2374
return;
}
window.addEventListener('load', () => {
const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
if (isLocalhost) {
// This is running on localhost. Let's check if a service worker still exists or not.
checkValidServiceWorker(swUrl, config);
// Add some additional logging to localhost, pointing developers to the
// service worker/PWA documentation.
navigator.serviceWorker.ready.then(() => {
console.log(
'This web app is being served cache-first by a service ' +
'worker. To learn more, visit https://bit.ly/CRA-PWA'
);
});
} else {
// Is not localhost. Just register service worker
registerValidSW(swUrl, config);
}
});
}
}
function registerValidSW(swUrl, config) {
navigator.serviceWorker
.register(swUrl)
.then(registration => {
registration.onupdatefound = () => {
const installingWorker = registration.installing;
if (installingWorker == null) {
return;
}
installingWorker.onstatechange = () => {
if (installingWorker.state === 'installed') {
if (navigator.serviceWorker.controller) {
// At this point, the updated precached content has been fetched,
// but the previous service worker will still serve the older
// content until all client tabs are closed.
console.log(
'New content is available and will be used when all ' +
'tabs for this page are closed. See https://bit.ly/CRA-PWA.'
);
// Execute callback
if (config && config.onUpdate) {
config.onUpdate(registration);
}
} else {
// At this point, everything has been precached.
// It's the perfect time to display a
// "Content is cached for offline use." message.
console.log('Content is cached for offline use.');
// Execute callback
if (config && config.onSuccess) {
config.onSuccess(registration);
}
}
}
};
};
})
.catch(error => {
console.error('Error during service worker registration:', error);
});
}
function checkValidServiceWorker(swUrl, config) {
// Check if the service worker can be found. If it can't reload the page.
fetch(swUrl, {
headers: { 'Service-Worker': 'script' },
})
.then(response => {
// Ensure service worker exists, and that we really are getting a JS file.
const contentType = response.headers.get('content-type');
if (
response.status === 404 ||
(contentType != null && contentType.indexOf('javascript') === -1)
) {
// No service worker found. Probably a different app. Reload the page.
navigator.serviceWorker.ready.then(registration => {
registration.unregister().then(() => {
window.location.reload();
});
});
} else {
// Service worker found. Proceed as normal.
registerValidSW(swUrl, config);
}
})
.catch(() => {
console.log(
'No internet connection found. App is running in offline mode.'
);
});
}
export function unregister() {
if ('serviceWorker' in navigator) {
navigator.serviceWorker.ready
.then(registration => {
registration.unregister();
})
.catch(error => {
console.error(error.message);
});
}
}
// jest-dom adds custom jest matchers for asserting on DOM nodes.
// allows you to do things like:
// expect(element).toHaveTextContent(/react/i)
// learn more: https://github.com/testing-library/jest-dom
import '@testing-library/jest-dom/extend-expect';
Source diff could not be displayed: it is too large. Options to address this: view the blob.
<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<title>Multiple Promises</title>
<script src="https://cdnjs.cloudflare.com/ajax/libs/rxjs/6.4.0/rxjs.umd.min.js"></script>
</head>
<body>
<script>
async function makeMulipleRequests() {
const p1 = await fetch('https://api.github.com/users/egonzal5');
console.log(p1);
const p2 = await p1;
console.log(p2);
//});
//const p2 = fetch('https://api.github.com/users/egonzal5').then(data => {
//return data.json();
//});
// const p1 = fetch('https://api.github.com/users/egonzal5');
// const p2 = fetch('https://api.github.com/users/arasevic');
// const results = await Promise.all([p1,p2]);
// const data = results.map(r => r.json());
// console.log(results);
// console.log(`Datais ${data}`);
// const EliasandAndrej = await Promise.all(data);
// const [Elias, Andrej] = await Promise.all(data);
// console.log(EliasandAndrej);
// console.log(Elias, Andrej);
}
async function getData(names) {
const promises = names.map(name => {
return fetch(`https://api.github.com/users/${name}`)
.then(r => r.json())
});
console.log(promises);
const repos = await Promise.all(promises); //wait for all promises to finish
console.log(repos);
}
makeMulipleRequests();
// try {
// getData(['egonzal5', 'arasevic']);
// } catch (err) {
// console.log("Whaaaaat");
// console.error(err);
// }
</script>
</body>
</html>
\ No newline at end of file
const ids = [1, 2, 3];
const books = [
{ title: 'The Great Gatsby', author: 'F. Scott Fitzgerald', id: 1 },
{ title: '100 Years of Solitude', author: 'Gabriel Garcia Marquez', id: 2 },
{ title: 'Death of Ivan Ilych', author: 'Leo Tolstoy', id: 3 },
];
const authors = [
{ name: 'F. Scott Fitzgerald', bio: 'American' },
{ name: 'Gabriel Garcia Marquez', bio: 'Columbian' },
{ name: 'Leo Tolstoy', bio: 'Russian' },
];
function getBookById(id) {
// create a new promise
return new Promise((resolve, reject) => {
// using a settimeout to mimic a database
setTimeout(() => {
// find the post we want
const book = books.find(book => book.id === id);
if(book) {
resolve(book); // send the book back
} else {
reject(Error('No Book Was Found!'));
}
}, 2000);
});
}
function hydrateAuthor(book) {
// create a new promise
return new Promise((resolve, reject) => {
// find the author
const authorDetails = authors.find(author => author.name === book.author);
if(authorDetails) {
// "hydrate" the post object with the author object
book.author = authorDetails;
resolve(book);
} else {
reject(Error(`Can not find the author for book ${book}`));
}
});
}
getBookById(1)
.then(book => {
return hydrateAuthor(book);
})
.then(book => {
console.log(book);
})
.catch(err => {
console.error(err);
});
for (let id of ids) {
getBookById(id)
.then(book => {
return hydrateAuthor(book);
})
.then(book => {
console.log(book);
})
.catch(err => {
console.error(err);
});
}
\ No newline at end of file
<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<title>Promises Start</title>
<script src="https://cdnjs.cloudflare.com/ajax/libs/rxjs/6.4.0/rxjs.umd.min.js"></script>
</head>
<body>
<script>
//use catch for the bad link
const p1 = fetch('https://api.githusk.djfb.kasjdbb.com/users/egonzal5');
const result = p1.then(data => {
return data.json()
}).then(r => {
console.log(r);
}).catch(err => console.log(err));
console.log(result);
</script>
</body>
</html>
\ No newline at end of file
<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<title>Promises Intro</title>
<script src="https://cdnjs.cloudflare.com/ajax/libs/rxjs/6.4.0/rxjs.umd.min.js"></script>
</head>
<body>
<script>
let result = new Promise((resolve, reject) => {
resolve('Bradley Beal Deserves Better');
// reject(new Error('The Wizards can have long term success'));
});
console.log(result);
result
.then( data => {
console.log(data);
})
.catch( error => {
console.error(error);
});
function add(x,y){
return x+y;
}
let adder = (x,y) => {
return x+y;
}
</script>
</body>
</html>
\ No newline at end of file
<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<title>Promises Intro 2</title>
<script src="https://cdnjs.cloudflare.com/ajax/libs/rxjs/6.4.0/rxjs.umd.min.js"></script>
</head>
<body>
<script>
const p1 = fetch('https://api.github.com/users/egonzal5');
p1.then(result => result.json())
.then(data => console.log(data))
.catch(err => {
console.log('Oh nooooo@@@');
console.error(err);
})
async function getInfo() {
console.log('inside async');
const p1 = fetch('').then(result => {
return result.json();
});
const data = await p1;
console.log(data.login);
}
getInfo();
try {
getInfo()
} catch(err) {
console.log('I don\'t exist!!!!!');
console.error(err);
}
</script>
</body>
</html>
\ No newline at end of file
const promise = new Promise(function(resolve, reject) {
console.log("Promise callback");
resolve("foo");
}).then(function(result) {
console.log("Promise callback (.then)");
}).then(function(result) {
console.log(result)
console.log("Promise callback (.second then)");
return "bar"
}).then((message) => console.log(message));
setTimeout(function() {
console.log("event-loop cycle: Promise (fulfilled)", promise)
}, 0);
console.log("Promise (pending)", promise);
\ No newline at end of file
<!DOCTYPE html>
<html>
<head>
<title>ES6 Modules</title>
</head>
<body>
<script type="module" src="./js/math.js"></script>
<script type="module" </script>
import add from "./js/math.js"
import {subtract} from "./js/math.js"
console.log(add(2,3,4,5))
console.log(subtract(4,10))
</script>
</body>
</html>
\ No newline at end of file
function addNums(...args) {
let values = [...args]
return values.reduce((accum, val) => accum + val )
}
let subtract = (num1, num2) => num1 - num2
export default addNums
export {subtract}
\ No newline at end of file
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