A Beginner's Guide to Redux-Observable

This blog post originally appeared on LogRocket’s Medium publication.

Redux-Observable is a Redux middleware that allows you to filter and map actions using RxJS operators. RxJS operators like filter() and map() let you transform streams of actions just like how JavaScript’s Array.prototype.filter() lets you transform arrays. In this article, I’ll show you how to get started with redux-observable using scripts you can run from Node.js.

Your First Epic

In redux-observable, an “epic” is a function that takes a stream of actions and returns a modified stream of actions. You can think of an epic as a description of what additional actions redux-observable should dispatch. An epic is analogous to the concept of a “saga” in redux-saga.

Before you write your first epic, you need to install redux-observable. This article assumes you already have Node.js and npm installed. To install redux-observable along with redux and RxJS, run the below command.

npm install redux@4.x redux-observable@1.x rxjs@6.x

The most fundamental function in the redux-observable API is the createEpicMiddleware() function. This function creates the actual Redux middleware you should pass to Redux’s applyMiddleware() function. Below is an example of creating a middleware that transforms actions with type ‘CLICK_INCREMENT’ into actions with type ‘INCREMENT’.

const { createEpicMiddleware } = require('redux-observable');
const { filter, map } = require('rxjs/operators');
const redux = require('redux');

// An 'epic' takes a single parameter, `action$`, which is an RxJS observable
// that represents the stream of all actions going through Redux
const countEpic = action$ => action$.pipe(
  filter(action => action.type === 'CLICK_INCREMENT'),
  map(action => {
    return { type: 'INCREMENT', amount: 1 };
  })
);

const observableMiddleware = createEpicMiddleware();
const store = redux.createStore(reducer, redux.applyMiddleware(observableMiddleware));

// **Must** add the epic to the observable after calling `applyMiddleware()`.
// Otherwise you'll get a warning: "epicMiddleware.run(rootEpic) called before
// the middleware has been setup by redux. Provide the epicMiddleware instance
// to createStore() first"
observableMiddleware.run(countEpic);

// Sample Redux reducer
function reducer(state = 0, action) {
  console.log('Action', action);

  switch (action.type) {
    case 'INCREMENT':
      return state + action.amount;
    default:
      return state;
  }
}

#redux

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A Beginner's Guide to Redux-Observable
Tia  Gottlieb

Tia Gottlieb

1596336480

Beginners Guide to Machine Learning on GCP

Introduction to Machine Learning

  • Machine Learning is a way to use some set of algorithms to derive predictive analytics from data. It is different than Business Intelligence and Data Analytics in a sense that In BI and Data analytics Businesses make decision based on historical data, but In case of Machine Learning , Businesses predict the future based on the historical data. Example, It’s a difference between what happened to the business vs what will happen to the business.Its like making BI much smarter and scalable so that it can predict future rather than just showing the state of the business.
  • **ML is based on Standard algorithms which are used to create use case specific model based on the data **. For example we can build the model to predict delivery time of the food, or we can build the model to predict the Delinquency rate in Finance business , but to build these model algorithm might be similar but the training would be different.Model training requires tones of examples (data).
  • Basically you train your standard algorithm with your Input data. So algorithms are always same but trained models are different based on use cases. Your trained model will be as good as your data.

ML, AI , Deep learning ? What is the difference?

Image for post

ML is type of AI

AI is a discipline , Machine Learning is tool set to achieve AI. DL is type of ML when data is unstructured like image, speech , video etc.

Barrier to Entry Has Fallen

AI & ML was daunting and with high barrier to entry until cloud become more robust and natural AI platform. Entry barrier to AI & ML has fallen significantly due to

  • Increasing availability in data (big data).
  • Increase in sophistication in algorithm.
  • And availability of hardware and software due to cloud computing.

GCP Machine Learning Spectrum

Image for post

  • For Data scientist and ML experts , TensorFlow on AI platform is more natural choice since they will build their own custom ML models.
  • But for the users who are not experts will potentially use Cloud AutoML or Pre-trained ready to go model.
  • In case of AutoML we can trained our custom model with Google taking care of much of the operational tasks.
  • Pre-trained models are the one which are already trained with tones of data and ready to be used by users to predict on their test data.

Prebuilt ML Models (No ML Expertise Needed)

  • As discuss earlier , GCP has lot of Prebuilt models that are ready to use to solve common ML task . Such as image classification, Sentiment analysis.
  • Most of the businesses are having many unstructured data sources such as e-mail, logs, web pages, ppt, documents, chat, comments etc.( 90% or more as per various studies)
  • Now to process these unstructured data in the form of text, we should use Cloud Natural Language API.
  • Similarly For common ML problems in the form of speech, video, vision we should use respective Prebuilt models.

#ml-guide-on-gcp #ml-for-beginners-on-gcp #beginner-ml-guide-on-gcp #machine-learning #machine-learning-gcp #deep learning

Dipesh Malvia

Dipesh Malvia

1631183395

React Redux Toolkit with Project | Redux Axios Tutorial | React Redux Tutorial For Beginners - 1

React Redux Toolkit with Project | Redux Axios Tutorial | React Redux Tutorial For Beginners - 1

In this video we are going to learn about React - Redux using Redux toolkit by build a project movie rating application from scratch. This video course is specially if you are planning to learn React with Redux Toolkit State Management library as a beginner. We will build a movie rating application and along with that we will use Axios for API calls, React Router DOM for Routing and Node-SASS for our SCSS compile to CSS. You will find the topics covered in the timestamp below.

⭐️GitHub link for Reference - https://github.com/dmalvia/React_Redux_ToolKit_Movie_App 

⭐️OMDB API - https://www.omdbapi.com/ 

⭐️ Support my channel - https://www.buymeacoffee.com/dipeshmalvia

🔥 Video contents... ENJOY 👇 

  • 0:00:00 - Intro 
  • 0:00:24 - Application Demo 
  • 0:02:23 - Unacademy Promo 
  • 0:04:48 - Code Walkthrough 
  • 0:07:54 - Installed Packages 
  • 0:08:32 - Movie Application Structure 
  • 0:09:54 - Creating Folder Structure and Files 
  • 0:14:10 - Adding functional component snippets 
  • 0:15:50 - OMDB API Key and usage 
  • 0:18:14 - Add Routing to Project 
  • 0:22:18 - Header Component with SCSS 
  • 0:27:49 - Adding common CSS to App.SCSS 
  • 0:29:41 - Footer Component with SCSS 
  • 0:31:36 - Home Component with SCSS 
  • 0:32:51 - Use Axios for API Call 
  • 0:37:44 - Adding Redux to Project 
  • 0:38:10 - Configure Redux Store 
  • 0:39:22 - Provide Store to App Component 
  • 0:40:30 - Redux Toolkit documentation walkthrough 
  • 0:42:28 - Create a Movie Slice 
  • 0:48:40 - useDispatch to dispatch action 
  • 0:51:10 - useSelector to access state 
  • 0:53:04 - Movie Listing Component with SCSS 
  • 0:58:22 - Movie Card Component with SCSS 
  • 1:05:29 - Outro 

***React Roadmap for Developers in 2021*** 

  • How to Learn React JS ? - https://youtu.be/06yVj8pcO5c 
  • React Fundamentals Project - https://youtu.be/QoJGKwo20is 
  • Learn React Redux with Project - https://youtu.be/0W6i5LYKCSI 
  • What is Redux ? - https://youtu.be/qNjNn9BCWCc 
  • Learn React Redux Thunk with Project - https://youtu.be/JDZRfLGNWdc 
  • Learn CSS GRID Tutorial - https://youtu.be/zs7JzkWixPo

🔗 Social Medias 🔗 

  • Twitter: https://twitter.com/IMDmalvia 
  • Facebook: https://www.facebook.com/programmingwithdipesh 
  • Instagram: https://www.instagram.com/dipeshmalvia 
  • LinkedIn: https://www.linkedin.com/in/dmalvia/ 

⭐️ Tags ⭐️ 

  • React Redux Toolkit 
  • React Redux Toolkit Tutorial 
  • React Redux Toolkit Crash course 
  • React Redux Toolkit Project
  • React Redux For Beginners 

⭐️ Hashtags ⭐️ 

#React #Redux #Toolkit #Beginners#Tutorials 

Disclaimer: It doesn't feel good to have a disclaimer in every video but this is how the world is right now. All videos are for educational purpose and use them wisely. Any video may have a slight mistake, please take decisions based on your research. This video is not forcing anything on you.
 

https://youtu.be/EnIRyNT2PMI

Dipesh Malvia

Dipesh Malvia

1631789409

React Redux Toolkit with Project | Redux Middleware Thunk | React Redux Tutorial For Beginners - 2

React Redux Toolkit with Project | Redux Middleware Thunk | React Redux Tutorial For Beginners - 2

In this video we are going to learn about React - Redux using Redux toolkit by build a project movie rating application from scratch. This video course is specially if you are planning to learn React with Redux Toolkit State Management library as a beginner. We will build a movie rating application and along with that we will use Axios for API calls, React Router DOM for Routing and Node-SASS for our SCSS compile to CSS. 

We will continue to enhance the application we will see how we can convert a synchronous action creator into a asynchronous action creator using Redux Middleware Thunk. 

You will find the topics covered in the timestamp below. 

⭐️React Redux Toolkit with Project - Part 1 - https://youtu.be/EnIRyNT2PMI 

⭐️GitHub link for Reference - https://github.com/dmalvia/React_Redux_ToolKit_Movie_App 

⭐️OMDB API - https://www.omdbapi.com/ 

⭐️ Support my channel - https://www.buymeacoffee.com/dipeshmalvia

 ***React Roadmap for Developers in 2021*** 

  • How to Learn React JS ? - https://youtu.be/06yVj8pcO5c 
  • React Fundamentals Project - https://youtu.be/QoJGKwo20is 
  • Learn React Redux with Project - https://youtu.be/0W6i5LYKCSI 
  • What is Redux ? - https://youtu.be/qNjNn9BCWCc 
  • Learn React Redux Thunk with Project - https://youtu.be/JDZRfLGNWdc 
  • Learn CSS GRID Tutorial - https://youtu.be/zs7JzkWixPo 

***Checkout these video to understand better*** 

  • JavaScript ES6 Arrow Functions - https://youtu.be/TgzVxiPdCDU 
  • JavaScript Higher Order Functions & Arrays Methods - https://youtu.be/m2_kagsc3_c 
  • JavaScript ES6 Destructuring - https://youtu.be/rpYg2M2lNAE 

🔥 Video contents... ENJOY 👇

  •  0:00:00 - Intro 
  • 0:00:24 - Application Demo 
  • 0:02:23 - Unacademy Promo 
  • 0:05:00 - Code Walkthrough Sync Action Creators 
  • 0:05:30 - Redux Middleware Thunk - Redux Toolkit 
  • 0:06:36 - Create Async Action Creator 
  • 0:08:57 - Create extraReducers 
  • 0:09:22 - Async Action Creator Lifecycle 
  • 0:13:41 - Async Action - Fetch Shows 
  • 0:15:53 - Add Shows to Movie Listing Component 
  • 0:18:57 - Add CSS Transition 
  • 0:20:13 - Navigation - Movie Detail Component 
  • 0:23:19 - Async Action - Fetch Movie Details 
  • 0:25:49 - useParams Hook 
  • 0:30:00 - Movie Detail Component with SCSS 
  • 0:42:10 - UseEffect Cleanup Function 
  • 0:43:00 - Sync Action - Remove Selected Movie/Show 
  • 0:45:04 - Conditional Movie Detail Loading 
  • 0:47:33 - Outro 

***More videos*** 

  • JSON Crash Course - https://youtu.be/6OhMbf2v_jI 
  • Asynchronous Vs Synchronous Programming - https://youtu.be/oesicy3CcXE 
  • Async JavaScript Callback - https://youtu.be/1zeuvEvw5uw 
  • Async JavaScript Promises Tutorial - https://youtu.be/JvV4Rz2PpzA 

***Checkout my crash courses for get started with web development*** 

  •  HTML5 Crash Course in 1 Hour - https://youtu.be/Aj3QFsmsagc 
  • CSS Crash Course in 1 Hour - https://youtu.be/nYsk_U_A_lc 
  • JavaScript Tutorial for Beginners - https://youtu.be/sptS-bgg8Ro

🔗 Social Medias 🔗 

  • Twitter: https://twitter.com/IMDmalvia 
  • Facebook: https://www.facebook.com/programmingwithdipesh 
  • Instagram: https://www.instagram.com/dipeshmalvia 
  • LinkedIn: https://www.linkedin.com/in/dmalvia/ 

⭐️ Tags ⭐️ 

  • React Redux Toolkit 
  • React Redux Toolkit Tutorial 
  • React Redux Toolkit Crash course 
  • React Redux Toolkit Project
  •  React Redux For Beginners 

⭐️ Hashtags ⭐️ 

#React #Redux #Toolkit #Beginners#Tutorials 

Disclaimer: It doesn't feel good to have a disclaimer in every video but this is how the world is right now. All videos are for educational purpose and use them wisely. Any video may have a slight mistake, please take decisions based on your research. This video is not forcing anything on you.

Abigail betty

Abigail betty

1624226400

What is Bitcoin Cash? - A Beginner’s Guide

Bitcoin Cash was created as a result of a hard fork in the Bitcoin network. The Bitcoin Cash network supports a larger block size than Bitcoin (currently 32mb as opposed to Bitcoin’s 1mb).

Later on, Bitcoin Cash forked into Bitcoin SV due to differences in how to carry on its developments.

That’s Bitcoin Cash in a nutshell. If you want a more detailed review watch the complete video. Here’s what I’ll cover:

0:50 - Bitcoin forks
2:06 - Bitcoin’s block size debate
3:35 - Big blocks camp
4:26 - Small blocks camp
5:16 - Small blocks vs. big blocks arguments
7:05 - How decisions are made in the Bitcoin network
10:14 - Block size debate resolution
11:06 - Bitcoin cash intro
11:28 - BTC vs. BCH
12:13 - Bitcoin Cash (ABC) vs. Bitcoin SV
13:09 - Conclusion
📺 The video in this post was made by 99Bitcoins
The origin of the article: https://www.youtube.com/watch?v=ONhbb4YVRLM
🔺 DISCLAIMER: The article is for information sharing. The content of this video is solely the opinions of the speaker who is not a licensed financial advisor or registered investment advisor. Not investment advice or legal advice.
Cryptocurrency trading is VERY risky. Make sure you understand these risks and that you are responsible for what you do with your money
🔥 If you’re a beginner. I believe the article below will be useful to you ☞ What You Should Know Before Investing in Cryptocurrency - For Beginner
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Thanks for visiting and watching! Please don’t forget to leave a like, comment and share!

#bitcoin #blockchain #bitcoin cash #what is bitcoin cash? - a beginner’s guide #what is bitcoin cash #a beginner’s guide

A Beginner’s Guide to Setting Up a Web Application with Typescript and Express

Web applications are types of software applications that run on remote servers (source). Examples of web applications can range from word processors, to file scanners, video editing tools, shopping carts, and more. Web applications can be great additions to any website; they can even function as websites themselves (Facebook, Gmail, and Udacity’s classroom are all examples of popular web applications), so understanding how to set up and implement a web application is a fantastic skill to have.

For this guide, I am assuming that you already have a basic knowledge of npmnode and whatExpress Requests and Responses are (or that you at least know what they are used for in their basic sense). Also, I assume that you know what the npm install and mkdir commands do. You have to know basic Typescript to implement — or at least know basic JavaScript to read and understand — the code below. Finally, this is the base for the backend of a web application. You still need to create a frontend application using a framework like Angular or an HTML/CSS file to make requests and display responses.

Before you start, it’s important that you create a folder in your favorite place on your computer. This can be anywhere as long as you have a sense of how you are going to find it later when you come up with an awesome project to start developing.

The Process:

Image for post

#web-development #backend #software-development #beginners-guide #beginner