count substrings
0 likes • Nov 19, 2022 • 0 views
JavaScript
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const hammingDistance = (num1, num2) =>((num1 ^ num2).toString(2).match(/1/g) || '').length;hammingDistance(2, 3); // 1
const luhnCheck = num => {let arr = (num + '').split('').reverse().map(x => parseInt(x));let lastDigit = arr.splice(0, 1)[0];let sum = arr.reduce((acc, val, i) => (i % 2 !== 0 ? acc + val : acc + ((val *= 2) > 9 ? val - 9 : val)),0);sum += lastDigit;return sum % 10 === 0;};luhnCheck('4485275742308327'); // trueluhnCheck(6011329933655299); // trueluhnCheck(123456789); // false
//Allegedly never tested on the twitter websitefunction scrapeScreen(){let articles = Array.from(document.getElementsByTagName("article"));let results = [];for(let tweet of articles){const isAnAd = Array.from(tweet.querySelectorAll("span")).map((e)=>e.textContent).includes("Ad");if(isAnAd){//console.log(tweet, "is an ad. Skipping...");continue;}const userName = tweet.querySelector("[data-testid='User-Name'] > div:nth-child(2) > div > div")?.textContent;const tweetContent = tweet.querySelector("[data-testid='tweetText']")?.textContent;const timeStamp = tweet.querySelector("time")?.getAttribute("datetime");const tweetLink = tweet.querySelector("time")?.parentElement?.getAttribute("href");if((!userName) || (!tweetContent)) continue;results.push({username: userName,tweetText: tweetContent,timeStamp: timeStamp,tweetLink: tweetLink});}return results;}let scraped = scrapeScreen();setInterval(()=>{scraped = scraped.concat(scrapeScreen().filter((tweet)=>{for(let scrapedTweet of scraped){if(scrapedTweet.username == tweet.username && scrapedTweet.tweetText == tweet.tweetText) return false;}return true;}));}, 500); //Scrape everything on the screen twice a secondwindow.scrollIntervalId = setInterval(function(){window.scrollBy(0, 1000);}, 500); //Scroll for me//http://bgrins.github.io/devtools-snippets/#console-save(function(console){console.save = function(data, filename){if(!data) {console.error('Console.save: No data')return;}if(!filename) filename = 'console.json'if(typeof data === "object"){data = JSON.stringify(data, undefined, '\t')}var blob = new Blob([data], {type: 'text/json'}),e = document.createEvent('MouseEvents'),a = document.createElement('a')a.download = filenamea.href = window.URL.createObjectURL(blob)a.dataset.downloadurl = ['text/json', a.download, a.href].join(':')e.initMouseEvent('click', true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null)a.dispatchEvent(e)}})(console)setTimeout(()=>{clearTimeout(window.scrollIntervalId);delete window.scrollIntervalId;console.save(scraped, "TwitterScrape" + Date.now() + ".json");}, 60 * 1000 * 20); //Twenty minutes
let test = 1;
class TreeNode {constructor(key, value = key, parent = null) {this.key = key;this.value = value;this.parent = parent;this.children = [];}get isLeaf() {return this.children.length === 0;}get hasChildren() {return !this.isLeaf;}}class Tree {constructor(key, value = key) {this.root = new TreeNode(key, value);}*preOrderTraversal(node = this.root) {yield node;if (node.children.length) {for (let child of node.children) {yield* this.preOrderTraversal(child);}}}*postOrderTraversal(node = this.root) {if (node.children.length) {for (let child of node.children) {yield* this.postOrderTraversal(child);}}yield node;}insert(parentNodeKey, key, value = key) {for (let node of this.preOrderTraversal()) {if (node.key === parentNodeKey) {node.children.push(new TreeNode(key, value, node));return true;}}return false;}remove(key) {for (let node of this.preOrderTraversal()) {const filtered = node.children.filter(c => c.key !== key);if (filtered.length !== node.children.length) {node.children = filtered;return true;}}return false;}find(key) {for (let node of this.preOrderTraversal()) {if (node.key === key) return node;}return undefined;}}const tree = new Tree(1, 'AB');tree.insert(1, 11, 'AC');tree.insert(1, 12, 'BC');tree.insert(12, 121, 'BG');[...tree.preOrderTraversal()].map(x => x.value);// ['AB', 'AC', 'BC', 'BCG']tree.root.value; // 'AB'tree.root.hasChildren; // truetree.find(12).isLeaf; // falsetree.find(121).isLeaf; // truetree.find(121).parent.value; // 'BC'tree.remove(12);[...tree.postOrderTraversal()].map(x => x.value);// ['AC', 'AB']
//JavaScript program to swap two variables//take input from the userslet a = prompt('Enter the first variable: ');let b = prompt('Enter the second variable: ');// XOR operatora = a ^ bb = a ^ ba = a ^ bconsole.log(`The value of a after swapping: ${a}`);console.log(`The value of b after swapping: ${b}`);