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Nov 18, 2022AustinLeath
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More JavaScript Posts

typewriter-effect in Vanilla JS and React

Jan 25, 2023C S

0 likes • 8 views

// Vanilla JS Solution:
var app = document.getElementById('app');
var typewriter = new Typewriter(app, { loop: true });
typewriter
.typeString("I'm John and I'm a super cool web developer")
.pauseFor(3000)
.deleteChars(13) // "web developer" = 13 characters
.typeString("person to talk with!") // Will display "I'm John and I'm a super cool person to talk with!"
.start();
// React Solution:
import Typewriter from 'typewriter-effect';
<Typewriter
options={{ loop: true }}
onInit={typewriter => {
typewriter
.typeString("I'm John and I'm a super cool web developer")
.pauseFor(3000)
.deleteChars(13) // "web developer" = 13 characters
.typeString("person to talk with!") // Will display "I'm John and I'm a super cool person to talk with!"
.start();
}}
/>

graph example

Nov 19, 2022CodeCatch

0 likes • 4 views

class Graph {
constructor(directed = true) {
this.directed = directed;
this.nodes = [];
this.edges = new Map();
}
addNode(key, value = key) {
this.nodes.push({ key, value });
}
addEdge(a, b, weight) {
this.edges.set(JSON.stringify([a, b]), { a, b, weight });
if (!this.directed)
this.edges.set(JSON.stringify([b, a]), { a: b, b: a, weight });
}
removeNode(key) {
this.nodes = this.nodes.filter(n => n.key !== key);
[...this.edges.values()].forEach(({ a, b }) => {
if (a === key || b === key) this.edges.delete(JSON.stringify([a, b]));
});
}
removeEdge(a, b) {
this.edges.delete(JSON.stringify([a, b]));
if (!this.directed) this.edges.delete(JSON.stringify([b, a]));
}
findNode(key) {
return this.nodes.find(x => x.key === key);
}
hasEdge(a, b) {
return this.edges.has(JSON.stringify([a, b]));
}
setEdgeWeight(a, b, weight) {
this.edges.set(JSON.stringify([a, b]), { a, b, weight });
if (!this.directed)
this.edges.set(JSON.stringify([b, a]), { a: b, b: a, weight });
}
getEdgeWeight(a, b) {
return this.edges.get(JSON.stringify([a, b])).weight;
}
adjacent(key) {
return [...this.edges.values()].reduce((acc, { a, b }) => {
if (a === key) acc.push(b);
return acc;
}, []);
}
indegree(key) {
return [...this.edges.values()].reduce((acc, { a, b }) => {
if (b === key) acc++;
return acc;
}, 0);
}
outdegree(key) {
return [...this.edges.values()].reduce((acc, { a, b }) => {
if (a === key) acc++;
return acc;
}, 0);
}
}
const g = new Graph();
g.addNode('a');
g.addNode('b');
g.addNode('c');
g.addNode('d');
g.addEdge('a', 'c');
g.addEdge('b', 'c');
g.addEdge('c', 'b');
g.addEdge('d', 'a');
g.nodes.map(x => x.value); // ['a', 'b', 'c', 'd']
[...g.edges.values()].map(({ a, b }) => `${a} => ${b}`);
// ['a => c', 'b => c', 'c => b', 'd => a']
g.adjacent('c'); // ['b']
g.indegree('c'); // 2
g.outdegree('c'); // 1
g.hasEdge('d', 'a'); // true
g.hasEdge('a', 'd'); // false
g.removeEdge('c', 'b');
[...g.edges.values()].map(({ a, b }) => `${a} => ${b}`);
// ['a => c', 'b => c', 'd => a']
g.removeNode('c');
g.nodes.map(x => x.value); // ['a', 'b', 'd']
[...g.edges.values()].map(({ a, b }) => `${a} => ${b}`);
// ['d => a']
g.setEdgeWeight('d', 'a', 5);
g.getEdgeWeight('d', 'a'); // 5

linear search

Nov 19, 2022CodeCatch

0 likes • 3 views

const linearSearch = (arr, item) => {
for (const i in arr) {
if (arr[i] === item) return +i;
}
return -1;
};
linearSearch([2, 9, 9], 9); // 1
linearSearch([2, 9, 9], 7); // -1

Composing components

Nov 19, 2022CodeCatch

0 likes • 3 views

function Welcome(props) {
return <h1>Hello, {props.name}</h1>;
}
function App() {
return (
<div>
<Welcome name="Sara" />
<Welcome name="Cahal" />
<Welcome name="Edite" />
</div>
);
}
ReactDOM.render(
<App />,
document.getElementById('root')
);

ESPN Web Scrape

Oct 15, 2023LeifMessinger

0 likes • 7 views

//Disclaimer: I do not condone mass web scraping of ESPN websites, and this is just theoretical code that hasn't been used.
//Scrape player stats off of https://www.espn.com/nfl/team/roster/_/name/phi/philadelphia-eagles
//Example player JS object
/*
{
"shortName": "S. Opeta",
"name": "Sua Opeta",
"href": "http://www.espn.com/nfl/player/_/id/3121009/sua-opeta",
"uid": "s:20~l:28~a:3121009",
"guid": "dec19157-e984-f981-3724-498281328c97",
"id": "3121009",
"height": "6' 4\"",
"weight": "305 lbs",
"age": 27,
"position": "G",
"jersey": "78",
"birthDate": "08/15/96",
"headshot": "https://a.espncdn.com/i/headshots/nfl/players/full/3121009.png",
"lastName": "Sua Opeta",
"experience": 4,
"college": "Weber State"
}
*/
//The page needs to be focused, so you have to put this code in a bookmarklet and click the page before clicking it. Allegedly.
navigator.clipboard.writeText(JSON.stringify(
window["__espnfitt__"].page.content.roster.groups.flatMap((group)=>{
return group.athletes.map((athlete)=>{
//We can assume all football players are above 100 lbs and below 1000 lbs.
athlete.weight = parseInt(athlete.weight.substring(0,3));
if(athlete.experience == "R") athlete.experience = 0;
else athlete.experience = parseInt(athlete.experience);
//We can assume players are at least 1 foot, or under 10 feet tall.
athlete.inches = 12 * parseInt(athlete.height.substring(0, 1)); //Add feet in inches
athlete.inches += parseInt(athlete.height.substring(2).replaceAll("\"", "").trim()); //Add remaining inches
const monthDayYear = athlete.birthDate.split("/");
athlete.birthMonth = parseInt(monthDayYear[0]);
athlete.birthDay = parseInt(monthDayYear[1]);
athlete.birthYear = parseInt(monthDayYear[2]);
//The only really useful stuff we get from this is Height, weight, left handedness, age, position, and birthday
return athlete;
});
})
, null, "\t")).then(null, ()=>{alert("That failed.")});
//Changes all the team links on this page https://www.espn.com/nfl/stats/team to the team's roster for easier scraping
$$("table > tbody > tr > td > div > div > a").forEach((elm)=>{
elm.setAttribute("href", elm.getAttribute("href").replace("team/", "team/roster/"));
});

React Short Circuit Evaluation

Feb 3, 2021C S

0 likes • 0 views

import React, { useState } from 'react' import Welcome from '../components/Welcome' function About() { const [showWelcome, setShowWelcome] = useState(false) return ( <div> {showWelcome ? <Welcome /> : null} </div> <div> {showWelcome && <Welcome /> } </div> ) } export default App