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Mastering Reactive Extensions (Rx) in C#

This document provides a comprehensive set of exercises to help you become proficient with Reactive Extensions (Rx) in C#. The exercises are organized by difficulty level: Beginner, Intermediate, Advanced, and Expert. Each exercise includes a description and its real-world application.

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Beginner Level

1. Create a Simple Observable and Subscribe to It

• Description: Create an observable sequence of integers (e.g., 1 to 10) using Observable.Range and subscribe to it. Print each value to the console.

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/**
 * Configuration options for JSON download
 */
interface DownloadJsonOptions {
	filename?: string;
	indent?: number;
	includeTimestamp?: boolean;
	prettify?: boolean;
	chunkSize?: number; // Size in MB for splitting large data
}

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/* Backdrop fade in/out */
.highlight-backdrop {
    @apply fixed inset-0 bg-black bg-opacity-50 transition-opacity duration-300 opacity-0 pointer-events-none;
    z-index: 1000;
}

.backdrop-visible {
    @apply opacity-100 pointer-events-auto; /* Show the backdrop */
}

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#!/bin/bash

# Loop through all files in the directory
for file in *; do
  # Check if the file exists and is a regular file
  if [[ -f "$file" ]]; then
    # Convert the file name to lowercase
    lowercase_name=$(echo "$file" | tr '[:upper:]' '[:lower:]')

    # Rename the file to lowercase

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#!/bin/bash

# Specify the directory path
directory="./"

# Change to the specified directory
cd "$directory" || exit

# Define the mapping array
declare -A mapping=(

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const loginEpic = actions$ => 
actions$.ofType(ActionTypes.LOGIN_REQUESTED)
    .switchMap(
        (loginAction) => Observable.ajax(POSTOptions('/api/login', loginAction.credentials),
        (action, r) => ([r, action])
    )
    .switchMap(
       ([loginResponse, action]) => Observable.ajax(
            GETOptions('/api/provider', [loginResponse.response.userToken, action.serviceProviderId] )
       )

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<script>
  //hide twitter avatar
	var hideTwitterAttempts = 0;
	function hideTwitterBoxElements() {
	  setTimeout( function() {
	    if ( $('[id*=twitter]').length ) {
	      $('[id*=twitter]').each( function(){
	        var ibody = $(this).contents().find( 'body' );
	        ibody.find( '.avatar' ).css( 'height', 0 );
	        ibody.find( '.avatar' ).css( 'width', 0 );

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'use strict';

function ChangeMachine() {

  var coins = {
    '75p'  : 75,
    '15p'  : 15,
    '3p'   : 3,
    '1p'   : 1,
    '1/2p' : 0.5,

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var x = req.param('x');
var y = req.param('y');
var z = req.param('z');

var undef = x && y && z;

if(undef == "undefined")
  return false;

return true;

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var x = req.param('x');
var y = req.param('y');
var z = req.param('z');

if( typeof x == 'undefined'
    || typeof y == 'undefined'
    || typeof z == 'undefined' )
    return false;

return true;