Canvas File Downloader
0 likes • Nov 18, 2022
JavaScript
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// There are n rings and each ring is either red, green, or blue. The rings are distributed across ten rods labeled from 0 to 9.// You are given a string rings of length 2n that describes the n rings that are placed onto the rods. Every two characters in rings forms a color-position pair that is used to describe each ring where:// The first character of the ith pair denotes the ith ring's color ('R', 'G', 'B').// The second character of the ith pair denotes the rod that the ith ring is placed on ('0' to '9').// For example, "R3G2B1" describes n == 3 rings: a red ring placed onto the rod labeled 3, a green ring placed onto the rod labeled 2, and a blue ring placed onto the rod labeled 1.// Return the number of rods that have all three colors of rings on them.let rings = "B0B6G0R6R0R6G9";var countPoints = function(rings) {let sum = 0;// Always 10 Rodsfor (let i = 0; i < 10; i++) {if (rings.includes(`B${i}`) && rings.includes(`G${i}`) && rings.includes(`R${i}`)) {sum+=1;}}return sum;};console.log(countPoints(rings));
function Clock(props) {return (<div><h1>Hello, world!</h1><h2>It is {props.date.toLocaleTimeString()}.</h2></div>);}function tick() {ReactDOM.render(<Clock date={new Date()} />,document.getElementById('root'));}setInterval(tick, 1000);
const jwt = require("jsonwebtoken");const authToken = (req, res, next) => {const token = req.headers["x-auth-token"];try {req.user = jwt.verify(token, process.env.ACCESS_TOKEN_SECRET);next();} catch (err) {console.log(err.message);res.status(401).json({ msg: "Error authenticating token" });}};module.exports = authToken;
const flat = arr => [].concat.apply([], arr.map(a => Array.isArray(a) ? flat(a) : a));// Orconst flat = arr => arr.reduce((a, b) => Array.isArray(b) ? [...a, ...flat(b)] : [...a, b], []);// Or// See the browser compatibility at https://caniuse.com/#feat=array-flatconst flat = arr => arr.flat();// Exampleflat(['cat', ['lion', 'tiger']]); // ['cat', 'lion', 'tiger']
// promisify(f, true) to get array of resultsfunction promisify(f, manyArgs = false) {return function (...args) {return new Promise((resolve, reject) => {function callback(err, ...results) { // our custom callback for fif (err) {reject(err);} else {// resolve with all callback results if manyArgs is specifiedresolve(manyArgs ? results : results[0]);}}args.push(callback);f.call(this, ...args);});};}// usage:f = promisify(f, true);f(...).then(arrayOfResults => ..., err => ...);
"use strict";const nodemailer = require("nodemailer");// async..await is not allowed in global scope, must use a wrapperasync function main() {// Generate test SMTP service account from ethereal.email// Only needed if you don't have a real mail account for testinglet testAccount = await nodemailer.createTestAccount();// create reusable transporter object using the default SMTP transportlet transporter = nodemailer.createTransport({host: "smtp.ethereal.email",port: 587,secure: false, // true for 465, false for other portsauth: {user: testAccount.user, // generated ethereal userpass: testAccount.pass, // generated ethereal password},});// send mail with defined transport objectlet info = await transporter.sendMail({subject: "Hello ✔", // Subject linetext: "Hello world?", // plain text bodyhtml: "<b>Hello world?</b>", // html body});console.log("Message sent: %s", info.messageId);// Message sent: <[email protected]>// Preview only available when sending through an Ethereal accountconsole.log("Preview URL: %s", nodemailer.getTestMessageUrl(info));// Preview URL: https://ethereal.email/message/WaQKMgKddxQDoou...}main().catch(console.error);