niinpatel

/*
Suppose I want to add two numbers, then double it, then square that number, then add double it again.
 */
addTwoNos(2, 3, (sum) => {
    double(sum, (doubleOfSum) => {
        square(doubleOfSum, (square) => {
            double(square, (doubleOfSquare) => {
                console.log(doubleOfSquare)
            })
        })

niinpatel

/*
Suppose I want to add two numbers, then double it, then square that number, then add double it again. Using Promises. 
 */
addTwoNos(2, 3)
    .then(sum => double(sum))
    .then(doubleOfSum => square(doubleOfSum))
    .then(square => double(square))
    .then(output => console.log(output))
    .catch(err => console.log(err));

niinpatel

/*
An aync function that takes two numbers and performs some operations
*/
performOperations(2,3).then(output => console.log(output)).catch(err => console.log(err));


async function performOperations(a,b) {

        let sum = await addTwoNos(a, b);
        let doubleOfSum = await double(sum);

niinpatel

/**
 * Asynchronous Map Function via async module
 */
const Async = require('async');

Async.map([1,2,3], double, (err, results) => {
    if(err) console.log(err);
    console.log(results)
} );

niinpatel

setTimeout(() => console.log('this code is executed asynchronously'), 0)

niinpatel

function playMontyHall(toSwitch) {

    let carIsIn = Math.floor(Math.random() * 3);

    let doorSelected = Math.floor(Math.random() * 3);

    let revealedDoor = [0,1,2].find((door) => door !== carIsIn && door !== doorSelected);

    if(toSwitch){
        return carIsIn === [0,1,2].find((door) => door !== doorSelected && door !== revealedDoor)

niinpatel

function simulateGame(num, toSwitch) {

    let gamesWon = 0;

    for(let i = 0; i < num; i++){
        gamesWon += playMontyHall(toSwitch)
    }

    return gamesWon
}

niinpatel

console.log(simulateGame(1000, toSwitch = true));  // play 1000 times, switch the door. Print how many times won. 

console.log(simulateGame(1000, toSwitch = false));  // play 1000 times, don't switch the door. Print how many times won. 

/* Output of first line will be close to 666 while that of second will be close to 333. */ 

niinpatel

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

const app = express();

let applications = [];


app.use(bodyParser.urlencoded({extended : true}));
app.use(bodyParser.json());

niinpatel

import React, {Component} from 'react';

class ResultComponent extends Component {


    render() {
        let {result} = this.props;
        return (
            <div className="result">
                <p>{result}</p>