Kursinhalt

Introduction to React

1. Getting Started: ES6

Why React?Node.js and npm ES6 Variables ES6 Arrow Functions ES6 Map Method ES6 Destructuring ES6 Spread Operator ES6 Ternary Operator

2. Getting Started: JSX

JSX Introduction JSX Variables & Nested Elements JSX Embedding Expressions JSX Specifying Attributes Getting Started with React

3. React in Practice

Getting familiar with JSX Writing more Complex Elements using JSX Creating a React-Based Project Structure of a React Project

4. React Components

Introduction to Components Functional Components Creating React Components Importing Components

5. Controlling Data & Content

Passing Data into Components Conditional Rendering Loop Based Rendering Keys in Lists Event Handling Creating a TODO Application

6. Hooks

Introduction to Hooks Using the State Hook The Effect Hook Rules of Using Hooks Creating Custom Hooks Fixing the Todo Application

7. React Router

Introduction to React Router Route-Based Rendering Creating Navigation Bars Using Params

ES6 Spread Operator

The spread operator (…) can be easily used to assign an array's values to another array.


              123
            
let arr = [5, 6, 7, 8, 9];
let numbers = [1, 2, 3, 4, ...arr];
console.log (numbers);

Changing the position of the...arr term will change the position of data in the output:


              123
            
let arr = [5, 6, 7, 8, 9];
let numbers = [1, 2, ...arr, 3, 4];
console.log (numbers);

The spread operator … unpacks the array arr elements and places them at the location. This can be used in many flexible ways, like passing arguments to a function:


              12345
            
let values = [1, 7, 9];
function sum(a, b, c) {
    return a + b + c;
}
console.log (sum(...values));

Task

Complete the following code by creating a new array called numbers and append the elements of both even and odd arrays (in this order) to the numbers array. Do it in a single line of code.

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Abschnitt 1. Kapitel 7

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