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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node:latest

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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The Complete Guide to Modern JavaScript

they will throw an error when trying to re-assign their value

they can only hold strings and not integers

### What is the main characteristic of a `symbol`?

<h3>What is the main characteristic of a <code>symbol</code>?</h3>


### What is the correct output of the following code?

```javascript
const friends = {
  "Tom" : "bff",
  "Jim" : "brother",
  "Tom" : "cousin",
}

for (friend in friends){
  console.log(friend);
}
```

<h3>What is the correct output of the following code?</h3>
<pre><code class="language-javascript">const friends = {
  &quot;Tom&quot; : &quot;bff&quot;,
  &quot;Jim&quot; : &quot;brother&quot;,
  &quot;Tom&quot; : &quot;cousin&quot;,
}

for (friend in friends){
  console.log(friend);
}
</code></pre>


### What is the correct output of the following code?

```javascript
const family = {
  [Symbol("Tom")] : "father",
  [Symbol("Jane")] : "mother",
  [Symbol("Tom")] : "brother",
};

const symbols = Object.getOwnPropertySymbols(family);
console.log(symbols);
```

<h3>What is the correct output of the following code?</h3>
<pre><code class="language-javascript">const family = {
  [Symbol(&quot;Tom&quot;)] : &quot;father&quot;,
  [Symbol(&quot;Jane&quot;)] : &quot;mother&quot;,
  [Symbol(&quot;Tom&quot;)] : &quot;brother&quot;,
};

const symbols = Object.getOwnPropertySymbols(family);
console.log(symbols);
</code></pre>


Get ready to learn about classes and prototype inheritance in the next lesson. 

In this lesson, we will solve a quiz related to the concepts covered in the previous lesson.

Introduction

Intro To JavaScript

ES6

From ES2016 to ES2022

Intro To TypeScript

Appendix

Quiz

What is a `symbol`?

Quiz

What is a symbol?

What is a `symbol`?