singhkumarhemant

Useful Links

MDN JavaScript

23 Free JavaScript Books

A curated collection of awesome & free JavaScript books to help you learn the JavaScript programming language.

If you know of any other free JavaScript books that you think should be on this list, please let me know in the comments section and I will get them added.

singhkumarhemant

const typeOfB = (value)=>Object.prototype.toString.call(value).split("]")[0].split(" ")[1].toLowerCase();

singhkumarhemant

const crypto = require('crypto')

function encrypt (text, key) {
  try {
    const IV_LENGTH = 16 // For AES, this is always 16
    let iv = crypto.randomBytes(IV_LENGTH)
    let cipher = crypto.createCipheriv('aes-256-cbc', Buffer.from(key), iv)
    let encrypted = cipher.update(text)

    encrypted = Buffer.concat([encrypted, cipher.final()])

singhkumarhemant

'use strict';

const crypto = require('crypto');

const ENCRYPTION_KEY = process.env.ENCRYPTION_KEY; // Must be 256 bits (32 characters)
const IV_LENGTH = 16; // For AES, this is always 16

function encrypt(text) {
 let iv = crypto.randomBytes(IV_LENGTH);
 let cipher = crypto.createCipheriv('aes-256-cbc', Buffer.from(ENCRYPTION_KEY), iv);

singhkumarhemant

function delay(t) {
    return new Promise(function(resolve) {
        setTimeout(resolve, t);
    });
}

work.create()
    .then(work.publish) //remote work submission
    .then(work.requestStatus)
    .then(function() {

singhkumarhemant

Generating a new ssh-key

Open Terminal. Paste the text below, substituting in your GitHub email address.

ssh-keygen -t rsa -b 4096 -C "your_email@example.com"

This creates a new ssh key, using the provided email as a label

Generating public/private rsa key pair.

singhkumarhemant

const waitFor = (ms) => new Promise(r => setTimeout(r, ms))
const asyncForEach = async (array, callback) => {
  for (let index = 0; index < array.length; index++) {
    await callback(array[index], index, array)
  }
}

const start = async () => {
  await asyncForEach([1, 2, 3], async (num) => {
    await waitFor(50)

singhkumarhemant

function ensureJquery(readyCallback) {
    if (window.jQuery === undefined || parseFloat(window.jQuery.fn.jquery) < 1.9) {
        var js = document.createElement('script');
        js.src = "http://ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js";
        if (js.readyState)
            js.onreadystatechange = function () {
                if (this.readyState == 'complete' || this.readyState == 'loaded') {
                    jQueryLoadHandler();
                }
            };

singhkumarhemant

function foo() {
console.log('sdjnkwjweujwkewkejbwekf')
return true; // if no return statement then typeof foo() will be undefined.
}
foo.bar = "hello world";
console.log(typeof foo); // "function"
console.log(typeof foo()); // "number"
console.log(typeof foo.bar);// string

singhkumarhemant

const SPENDING_THRESHOLD = 200;
const TAX_RATE = 0.08;
const PHONE_PRICE = 99.99;
const ACCESSORY_PRICE = 9.99;

var bank_balance = 303.91;
var amount = 0;

function calculateTax(amount) {
	return amount * TAX_RATE;