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Hands-on JavaScript for Python Developers

You're reading from   Hands-on JavaScript for Python Developers Leverage your Python knowledge to quickly learn JavaScript and advance your web development career

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Product type Paperback
Published in Sep 2020
Publisher Packt
ISBN-13 9781838648121
Length 410 pages
Edition 1st Edition
Languages
Tools
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Author (1):
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 Nagale Nagale
Author Profile Icon Nagale
Nagale
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Table of Contents (26) Chapters Close

Preface 1. Section 1 - What is JavaScript? What is it not?
2. The Entrance of JavaScript into Mainstream Programming FREE CHAPTER 3. Can We Use JavaScript Server-Side? Sure! 4. Nitty-Gritty Grammar 5. Data and Your Friend, JSON 6. Section 2 - Using JavaScript on the Front-End
7. Hello World! and Beyond: Your First Application 8. The Document Object Model (DOM) 9. Events, Event-Driven Design, and APIs 10. Working with Frameworks and Libraries 11. Deciphering Error Messages and Performance Leaks 12. JavaScript, Ruler of the Frontend 13. Section 3 - The Back-End: Node.js vs. Python
14. What Is Node.js? 15. Node.js versus Python 16. Using Express 17. React with Django 18. Combining Node.js with the Frontend 19. Enter Webpack 20. Section 4 - Communicating with Databases
21. Security and Keys 22. Node.js and MongoDB 23. Putting It All Together 24. Assessments 25. Other Books You May Enjoy

Functions

Ah, functions. We love them because they're the key to modular, don't-repeat-yourself (DRY) programs. The use cases in JavaScript and Python are the same: blocks of code intended to be called more than once, usually with varying parameters. Parameters are the variables that a function will take in order to execute its code on a mutable dataset. Arguments are what we pass when we call a function. They're the same thing in essence, but have different words depending on where and when they're used: are they the abstraction, or are they the actual data? Let's take a look at a side-by-side comparison:

Python JavaScript
def add_one(x):
x += 1
return x

print(add_one(5))
// output is 6
function addOne(val) {
return ++val
}

console.log(addOne(5))
// output is 6

 

If you haven't already brought up the JavaScript console in your browser, you should do that now to see our output of 6.

You can see that the structure is fairly similar, with our...

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