JS Test
0 likes • Mar 9, 2021
JavaScript
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const MongoClient = require('mongodb').MongoClient;const assert = require('assert');// Connection URLconst url = 'mongodb://localhost:27017';// Database Nameconst dbName = 'myproject';// Use connect method to connect to the serverMongoClient.connect(url, function(err, client) {assert.equal(null, err);console.log("Connected successfully to server");const db = client.db(dbName);client.close();});
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
const compactObject = val => {const data = Array.isArray(val) ? val.filter(Boolean) : val;return Object.keys(data).reduce((acc, key) => {const value = data[key];if (Boolean(value))acc[key] = typeof value === 'object' ? compactObject(value) : value;return acc;},Array.isArray(val) ? [] : {});};const obj = {a: null,b: false,c: true,d: 0,e: 1,f: '',g: 'a',h: [null, false, '', true, 1, 'a'],i: { j: 0, k: false, l: 'a' }};compactObject(obj);// { c: true, e: 1, g: 'a', h: [ true, 1, 'a' ], i: { l: 'a' } }
const insertionSort = arr =>arr.reduce((acc, x) => {if (!acc.length) return [x];acc.some((y, j) => {if (x <= y) {acc.splice(j, 0, x);return true;}if (x > y && j === acc.length - 1) {acc.splice(j + 1, 0, x);return true;}return false;});return acc;}, []);insertionSort([6, 3, 4, 1]); // [1, 3, 4, 6]
//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}`);
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