Book Image

Hands-on JavaScript for Python Developers

By : Sonyl Nagale
Book Image

Hands-on JavaScript for Python Developers

By: Sonyl Nagale

Overview of this book

Knowledge of Python is a great foundation for learning other languages. This book will help you advance in your software engineering career by leveraging your Python programming skills to learn JavaScript and apply its unique features not only for frontend web development but also for streamlining work on the backend. Starting with the basics of JavaScript, you’ll cover its syntax, its use in the browser, and its frameworks and libraries. From working with user interactions and ingesting data from APIs through to creating APIs with Node.js, this book will help you get up and running with JavaScript using hands-on exercises, code snippets, and detailed descriptions of JavaScript implementation and benefits. To understand the use of JavaScript in the backend, you’ll explore Node.js and discover how it communicates with databases. As you advance, you’ll get to grips with creating your own RESTful APIs and connecting the frontend and backend for holistic full-stack development knowledge. By the end of this Python JavaScript book, you’ll have the knowledge you need to write full-fledged web applications from start to finish. You’ll have also gained hands-on experience of working through several projects, which will help you advance in your career as a JavaScript developer.
Table of Contents (26 chapters)
1
Section 1 - What is JavaScript? What is it not?
6
Section 2 - Using JavaScript on the Front-End
13
Section 3 - The Back-End: Node.js vs. Python
20
Section 4 - Communicating with Databases

Working with input in a function

If we take a look at the preceding object, we'll see the following:

if (values.indexOf(answer) < 0) {
alert('Value not found')
} else {
alert(this[answer])
}
...

Since we're dealing with arbitrary input, the first thing we're doing is checking against our array of answers to see whether the property requested exists. If it does not, a simple error message is alerted. If it is found, then we can alert the value. If you remember from Chapter 3, Nitty-Gritty Grammar, object properties can be accessed via dot notation and bracket notation. In this case, we're working with a variable as the key, so we can't do this because it would be interpreted as the key. Thus, we use bracket notation to access the proper object value.

Exercise – Fibonacci sequence

For this exercise, construct a function to take a number. The end result should be the sum of numbers in the Fibonacci sequence (https://en.wikipedia.org/wiki/Fibonacci_number...