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1. Upload file by fs writeFile with Nod... Upload file by fs writeFile with Node Js

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   const fs = require('fs');

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   const express = require('express');

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   const bodyParser = require('body-parser');

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   const path = require('path');

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   const app = express();

2. Arrow function and different between... Arrow function and different between regular function

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   // Regular Function with "this"

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   function Car() {

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     this.speed = 0;

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     this.speedUp = function(speed) {

3. Here description all promise methods... Here description all promise methods with examples.

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   // Promise.all

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   //will reject with this first rejection message

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   const p1 = new Promise((resolve, reject) => {

4. Creational Design Pattern with example Creational Design Pattern with example

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   // Singleton pattern

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   // SINGLEton. We use this design pattern when we only want a single instance of a class. 

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   // That means we cannot create multiple instances - just one. If there is no instance, a new one is created.

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   // If there is an existing instance, it will use that one.

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