MERN Training

Chapter 1 - React Overview

• What is React?
• What's in a Name?
• React Component Model
• What React Is Not
• What You Will Not Find in React
• Motivation for Creating React
• A React JavaScript Example
• One-Way Data Flow
• JSX
• A JSX Example
• The Virtual (Mock) DOM
• Only Sub-components that Actually Change are Re-Rendered
• React Libraries
• Summary

Chapter 2 - ES6 in a Nutshell

• What is ES6?
• ES6 Features
• Using ES6
• Transpiling
• Major Syntax Changes
• let and const
• Variable Scope
• Shadowing Variables
• Arrow Functions
• Arrow Functions As Parameters
• Using 'this' Within Arrow Functions
• Template Literals
• Spread Operator
• ES6 Classes
• Declaring Classes
• Declaring Instance Methods
• Accessor Methods
• Static Methods
• Inheritance With Classes
• Summary

Chapter 3 - Babel Command-Line Interface

• Babel Transpiler
• Usage Options
• Presets and Plug-ins
• Babel CLI Installation
• Babel Configuration
• Running Babel Command-Line
• A Basic ES6 Development Setup with Babel
• Test the Babel Development Setup
• Adding React to the Development Setup
• Create a Minimal React App - Index.html
• Create a Minimal React App - app.js
• Summary

Chapter 4 - Basic Components and JSX

• What is JSX?
• JSX Transpilation to React Code Example
• Running the Transpiled Code
• Babel
• The Babel Runtime JavaScript Library
• Script Import Skeleton Code
• Playing Around in CodePen
• React Components
• Ways to Create UI Components
• Creating a Functional Component Example
• Component Names Must Be Capitalized
• Creating a React Class-Based Component in ES5
• The render Method
• Creating a UI Component Using ES6 Class Notation
• Using ES6 Classes with React
• Which UI Component Creation Syntax Should I Use?
• Components vs Elements
• Elements Are Immutable
• Properties
• Property Naming Convention
• Properties Default to 'True'
• Spread Attributes (an ES6 Feature)
• Expressions
• Fragments
• Summary

Chapter 5 - React Functional Component Concepts

• Functional Components
• Nesting JSX Elements
• Example of JSX Nesting
• Comments in JSX Code
• Setting CSS Styles Using Classes
• Setting CSS Styles Directly
• JSX Escapes Values
• Working with Lists of Items
• Keys in Lists
• Example List With Key
• Container vs. Presentational Components
• State
• Types of State Data
• State Hierarchy
• Lifting State Up
• Props vs. State
• Pass Down a Function
• Immutability
• Immutability – Why?
• Virtual DOM and State
• Setting state
• Updating Input fields
• Passing Props to Components
• Passing Functions to Components
• Event Handling
• Event Handler Example
• Event Binding - DOs
• Event Binding – Don'ts
• Passing Parameters to Event Handlers
• Component Life-cycle
• Life-cycle in Functional Components
• App Development Workflow – 1/3
• App Development Workflow – 2/3
• App Development Workflow – 3/3
• Summary

Chapter 6 - React Components with ES6 Classes

• Classes in ES6
• Functional Components
• Extending React.Component
• The render() Method
• state
• props
• defaultProps
• propTypes
• Component Lifecycle
• Component Life-cycle: Overview
• Component Life-cycle – Render Phase
• Component Life cycle – Commit Phase
• Component Life-cycle – Unmounting
• constructor() example
• componentDidMount() example
• setState( newStateValue )
• Summary

Chapter 7 - React Router

• Routing and Navigation
• react-router
• Creating a react-router based project
• A Basic Routed Component
• Router vs. BrowserRouter
• The Route component
• <Switch>
• Redirect Route
• Navigating with <Link>
• Navigating with <NavLink>
• Route Parameters
• Retrieving Route Parameters
• QueryString Parameters
• Using Router with Redux
• Summary

Chapter 8 - State Management for React

• React State Basics – Props and State
• Props
• State in Class Based Components
• Managing State with Hooks in Functional Components
• The Problem with Props and State
• Redux State Library
• Redux Advantages
• Redux Disadvantages
• Basic Rules for State Management
• Types of State
• Data State
• Communication State
• Control State
• Session State
• Location State
• Location State Side Effects
• Summary

Chapter 9 - Using React Hooks

• Functional Component Shortcomings
• Hooks Overview
• Hook Rules
• React Linter Example
• Functional Component Props
• The useState Hook
• Functional Component using the useState hook
• useState with Multiple Variables
• useState can also be used with Objects
• The useEffect Hook
• useEffect Hook Example
• Using useEffect Hook to Load Data
• Restricting when useEffect is Called
• The useContext Hook
• Additional Hooks
• The useReducer Hook
• An Example Reducer Function
• Calling and Using useReducer
• The useMemo Hook
• useMemo Example
• The useCallback Hook
• useCallback Example
• The useRef Hook
• Using useRef to Hold Values
• The useImperativeHandle Hook
• useImperativeHandle Hook Example
• The useLayoutEffect Hook
• Summary

Chapter 10 - Unit Testing React with React Testing Library

• React Testing Framework
• Features
• Snapshot Testing
• Code Coverage
• Interactive Mode
• Projects created with create-react-app
• Default App Component Test
• Unit Tests
• Anatomy of a Unit Test
• Common Matchers
• Combining Tests
• Running Tests
• Testing Promise based async code with 'done'
• Setup and Teardown
• react-testing-library
• A Simple Component Test
• A Simple Snapshot Test
• Running and Updating SnapShot Tests
• Building Component Tests
• Calling Render
• Render Properties
• Simulating Events
• Testing Results
• Using Query Functions
• Text Matching
• Counter Component
• counter-test.js
• Summary

Chapter 11 - Introduction to MongoDB

• MongoDB
• MongoDB Features
• MongoDB on the Web
• Positioning of MongoDB
• MongoDB Applications
• MongoDB Data Model
• MongoDB Limitations
• MongoDB Use Cases
• MongoDB Query Language (QL)
• The CRUD Operations
• The find Method
• The findOne Method
• A MongoDB Query Language (QL) Example
• Inserts
• MongoDB vs Apache CouchDB
• Summary

Chapter 12 - Working with Data in MongoDB

• Reading Data in MongoDB
• The Query Interface
• Query Syntax is Driver-Specific
• Projections
• Query and Projection Operators
• MongoDB Query to SQL Select Comparison
• Cursors
• Cursor Expiration
• Writing Data in MongoDB
• An Insert Operation Example
• The Update Operation
• Update Operation Options
• An Update Operation Example
• A Remove Operation Example
• Limiting Return Data
• Data Sorting
• Aggregating Data
• Aggregation Stages
• Accumulators
• An Example of an Aggregation Pipe-line
• Map-Reduce
• Summary

Chapter 13 - Introduction to Node.js

• What Is Node.js?
• Applications of Node.js
• Installing Node.js and NPM
• "Hello, Node World!"
• How It Works
• Node.js is built on JavaScript: Benefits
• Traditional Server-Side I/O Model
• Disadvantages of the Traditional Approach
• Event-Driven, Non-Blocking I/O
• Concurrency
• Using Node Package Manager (NPM)
• The Express Server Framework
• Summary

Chapter 14 - Basic Web Application Development

• Introduction to the HTTP Module
• The Request Handler Callback Function
• The Server Object
• Example Use of Server Object
• The Request Object
• The Response Object
• Parsing Request Body
• Serving Static Files
• The HTTP Client API
• Making POST/PUT/etc. Requests
• Where To go from Here?
• Summary

Chapter 15 - Introduction to Express

• Introduction to Express
• Basic Routing Example
• Defining Routing Rules
• Route Path
• The Response Object
• Supplying URL Parameters
• Ordering of Routes
• Defining Catch All Route
• Full Example Web Service
• Summary

Chapter 16 - Express Middleware

• Introduction to Express Middleware
• Writing a Middleware Function
• Binding to a Path
• Order of Execution
• Raising Error
• Handling Error
• Serving Static Files
• Handling POST Request Body
• Enable Response Compression
• Summary

Chapter 17 - Accessing MongoDB from Node.js

• Getting Started
• The Connection URL
• Obtaining a Collection
• Inserting Documents
• Updating a Document
• Querying for Documents
• Deleting a Document
• Connection Pooling
• Summary

Appendix A - Building React Apps with Redux

• Redux
• Redux Terminology
• Redux Principles
• Redux: Actions
• Redux Action Types
• Action Creators
• Dispatching Actions
• Data Flow Basics
• Redux Reducers
• Pure Functions
• Reducer Example
• Returning Default State
• Creating a Development Environment with create-react-app
• Using Redux with React
• Initializing the Store
• Immutability
• Benefits of Immutable State
• Mutability of Standard types
• Copying Objects in JavaScript
• Copying Arrays in JavaScript
• One Store - Multiple Reducers
• Combining Reducers
• Components and Redux
• The React-Redux Package
• Wrapping App with Provider
• mapStateToProps
• mapDispatchToProps
• Using Mapped Properties and Methods
• Wrapping Components with Connect
• Configure Store
• Programming Advice - MultiTab Console
• Summary

Appendix B - Indexes in MongoDB

• Indexes in MongoDB
• Creating an Index
• Listing Existing Indexes
• The Sort Order
• Using the Explain() Method
• Main Index Types
• The _id Field
• Single and Compound Indexes
• Multikey Indexes
• Other Index Types
• Index Properties
• Examples of Creating Indexes with Index Properties
• Summary

Appendix C - Events in Node JS

• Event Driven Programming
• Event Driven Programming (Contd.)
• Event Emitter
• EventEmitter Class
• EventEmitter Class – Inheritance
• The Event Loop and Event Handler
• Phases Overview
• Event Handlers
• Example (Using EventEmitter as an Object)
• Example (Inheriting from EventEmitter)
• EventEmitter Functions
• Issue with 'this' Keyword in Callback Functions
• Handling this Problem
• Controlling Event Callbacks in the Event Loop
• Summary

Appendix D - Asynchronous Programming with Callbacks

• Synchronous and Asynchronous
• Callbacks
• Creating a Callback Function
• Calling The Callback Function
• Callback - Another Example
• Issue with 'this' Keyword in Callback Functions
• Handling this Problem
• Handling this Problem – Method 1 (Storing in Another Variable)
• Handling this Problem – Method 2 (Using Bind Function)
• Handling this Problem – Method 3 (Using ES6 Arrow Functions)
• Error Handling without Callback
• Error Handling with Callback
• Asynchronous Callback
• setImmediate() and nextTick()
• API Example
• Summary

Appendix E - Asynchronous Programming with Promises

• The Problems with Callbacks
• Introduction to Promises
• Requirements for Using Promises
• Creating Promises Manually
• Calling the Promise-based Function
• Making APIs that support both callbacks and promises
• Using APIs that support both callbacks and promises
• Chaining then Method / Returning a Value or a Promise from then Method
• Promisifying Callbacks with Bluebird
• Using Bluebird
• Bluebird – List of Useful Functions
• Benefit of using Bluebird over ES6 for Promisification
• Error Handling in Promise-based asynchronous functions
• Summary