Rajiv Narayana Singaseni rajivnarayana

## 1.callback_hell.js
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) {

## README.MD

      
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                rajivnarayana
                / README.MD
            
            
              Created
              May 11, 2021 10:59
            
              
                NodeJS - Create a server from core modules.
              
          
    Objective

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


http
url

Concepts


## svg-demo.html
<html>
    <head>
        <style>
            .body {
                background-color: green;
            }
            .source_container {
                position: relative;
                padding: 20px 20px;
                background-color: red;

## promise-async-error.js
/**
 * 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.
 */

## roman-numerals.js
/**
 * 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

## problem.py
# 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")

## async-await-hello-world.js
//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();

## array_promises.js
/**
 * 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.
 */

## problem.txt
[
{"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"},
]

Expected output :

## ClampedHeaderScrolling.tsx
import React, {Component} from 'react';
import {
  Text,
  View,
  Animated,
  StyleSheet,
  SafeAreaView,
  FlatList,
  LayoutChangeEvent,
} from 'react-native';
	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) {
	<html>
	<head>
	<style>
	.body {
	background-color: green;
	}
	.source_container {
	position: relative;
	padding: 20px 20px;
	background-color: red;
	/**
	* 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';