vipinrana

let obj = {id: 1, name: "John Doe", age: 25};


/**
 * Object.freeze()
 * 
 * In freeze object, addition, updation and delete operation cannot be done except read
 * 
 */

vipinrana

/*
 * Promise.race will first settled either fulfilled or rejected from the iterable object
 *
 * Promise.any find the first fulfilled without concern of reject promise from the iterable object. 
 * If all are rejected promise then it will result an AggregateError.
 *
 */

// On passing first resolve and second reject promise

vipinrana

db.collection_name.insert([
  {_id: 1, name: "John Doe", age: 25},
  {_id: 2, name: "Foo Bar", age: 35},
  {_id: 3, name: "Hello World"}
]);

// create sparse index
db.scores.createIndex( { age: 1 } , { sparse: true } );

// count the sparse Indexes Field will output 2

vipinrana

const {performance} = require('perf_hooks');

// using hrtime API
const hrBefore = process.hrtime();

setTimeout(function () {

    const hrAfter = process.hrtime(hrBefore);

    console.log(`Using hrtime ${hrAfter[0] * 1e3 + hrAfter[1] / 1e6}ms`);