Gain insights into JavaScript from basics to ES2021, delve into TypeScript essentials, and test your knowledge through quizzes and coding challenges to reinforce learning.

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Jan/2021 Updated to include ES2021

Whether you are a complete beginner or you have some knowledge of JavaScript, this course will guide you from the basics of the language to all the new features introduced up until 2021.  You’ll test your knowledge with quizzes and some coding challenges at the end of each chapter. 

After following this course, the functions and variables let, const, generators, promises and async won't be a problem anymore.

If you want to experience something new, this course also includes an introduction to the basics of TypeScript, which is a must-know for any JavaScript developer.

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Just completed this amazing ebook  by @montalesi. I would recommend anyone who is looking to upgrade their es6, 7 or 8 knowledge to go through the book once. It is short crisp and to the point and serves as a great resource that you can go through in limited time

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I have been working as a front-end developer for over 5 years but I am still reading the book by @montalesi because I find it really exhaustive and well written.

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The Complete Guide to Modern JavaScript


ES2017 introduced many cool new features, which we’ll check out below.

# String padding (`.padStart()` and `.padEnd()`)

We can now add some padding to our strings, either at the end (`.padEnd()`) or at the beginning (`.padStart()`) of them.

console.log("hello".padStart(6));
// " hello"
console.log("hello".padEnd(6));
// "hello "


We specified that we want 6 as our padding, so then why in both cases did we only get 1 space?
It happened because `padStart` and `padEnd` will go and fill the **empty spaces**. In our example "hello" is 5 letters, and our padding is 6, which leaves only 1 empty space.

Look at this example:

console.log("hi".padStart(10));
// 10 - 2 = 8 empty spaces
// "        hi"
console.log("welcome".padStart(10));
// 10 - 6 = 4 empty spaces
// "   welcome"


&nbsp;

## Right align with `padStart`

We can use `padStart` if we want to right align something.

const strings = ["short", "medium length", "very long string"];

const longestString = strings.sort(str => str.length).map(str => str.length)[strings.length -1];

strings.forEach(str => console.log(str.padStart(longestString)));

// very long string
//    medium length
//            short


First we grabbed the longest of our strings and measured its length. We then applied a `padStart` to all the strings based on the length of the longest so that we now have all of them perfectly aligned to the right.

&nbsp;

## Add a custom value to the padding

We are not bound to just add a white space as a padding- we can pass both strings and numbers.

Let's discover  the many new and interesting features that ES2017 brought.

Introduction

Intro To JavaScript

ES6

From ES2016 to ES2022

Intro To TypeScript

Appendix

ES2017: String Padding, Object.entries(), and More

String padding (`.padStart()` and `.padEnd()`) #

Right align with `padStart` #

ES2017: String Padding, Object.entries(), and More

String padding (.padStart() and .padEnd()) #

Right align with padStart #

String padding (`.padStart()` and `.padEnd()`) #

Right align with `padStart` #