Rajiv Narayana Singaseni rajivnarayana

Objective

Create a bare bones server using nodejs core modules and not expressjs.

	const fs = require("fs");
	const path = "./temp.txt";

	const errorCallback = (err) => {
	console.log(err);
	console.log("Failed writing to the files");
	}

	const doneCallback2 = (err) => {
	if(err) {

	/**
	* This is a modified form of issue https://github.com/caolan/async/issues/1611 with title
	* "waterfall Callback was already called. #1611"
	*
	* Reason:
	* First, the line no 16 executes causing the next waterfall step to execute.
	* Subsequently line no 25 causes an exception which is gaurded by Promise.then in the first step
	* which in turn causes catch block in line no 21 to be executed.
	*/

	/**
	* Write a program to encode a given number in roman numeral form
	// I - 1
	// V - 5
	// X - 10
	// L - 50
	// C - 100
	// D - 500
	// M - 1000
	* @param {*} number

	# Online Python compiler (interpreter) to run Python online.
	# Write Python 3 code in this online editor and run it.
	students = [
	{"name": "user1", "marks": 10, "gender": "male"},
	{"name": "user2", "marks": 12, "gender": "male"},
	{"name": "user3", "marks": 15, "gender": "male"},
	{"name": "user4", "marks": 20, "gender": "female"},
	{"name": "user5", "marks": 25, "gender": "female"}]

	print("1: print all student names")

	//Rentrant function. - Software terminology
	//generator functions. - javascript terminology ()
	//Read more here https://codeburst.io/understanding-generators-in-es6-javascript-with-examples-6728834016d5

	function wait() {
	return new Promise(resolve => setTimeout(resolve, 3000));
	}

	async function sayAwaitHello() {
	await wait();

	/**
	* A simple promise generator that waits for n seconds and returns a promise that resolves to n.
	*/
	function wait(n) {
	return new Promise(resolve => setTimeout(resolve.bind(null, n), n * 1000));
	}

	/**
	* A simple function that invokes promise and displays the result.
	*/

	import React, {Component} from 'react';
	import {
	Text,
	View,
	Animated,
	StyleSheet,
	SafeAreaView,
	FlatList,
	LayoutChangeEvent,
	} from 'react-native';