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//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}`);
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 powerset = arr =>arr.reduce((a, v) => a.concat(a.map(r => r.concat(v))), [[]]);powerset([1, 2]); // [[], [1], [2], [1, 2]]
"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);
const deepMerge = (a, b, fn) =>[...new Set([...Object.keys(a), ...Object.keys(b)])].reduce((acc, key) => ({ ...acc, [key]: fn(key, a[key], b[key]) }),{});deepMerge({ a: true, b: { c: [1, 2, 3] } },{ a: false, b: { d: [1, 2, 3] } },(key, a, b) => (key === 'a' ? a && b : Object.assign({}, a, b)));// { a: false, b: { c: [ 1, 2, 3 ], d: [ 1, 2, 3 ] } }
const gcd = (...arr) => {const _gcd = (x, y) => (!y ? x : gcd(y, x % y));return [...arr].reduce((a, b) => _gcd(a, b));};gcd(8, 36); // 4gcd(...[12, 8, 32]); // 4